diff --git a/semeio/workflows/localisation/local_config_script.py b/semeio/workflows/localisation/local_config_script.py
index 9f5c5a204..4d4763cee 100644
--- a/semeio/workflows/localisation/local_config_script.py
+++ b/semeio/workflows/localisation/local_config_script.py
@@ -1,26 +1,25 @@
-from ert_shared.libres_facade import LibresFacade
 from ert_shared.plugins.plugin_manager import hook_implementation
 
 import semeio.workflows.localisation.local_script_lib as local
 from semeio.communication import SemeioScript
-from semeio.workflows.localisation.localisation_config import LocalisationConfig
+from semeio.workflows.localisation.localisation_config import (
+    LocalisationConfig,
+    get_max_gen_obs_size_for_expansion,
+)
 
 
 class LocalisationConfigJob(SemeioScript):
     def run(self, *args):
         ert = self.ert()
-        facade = LibresFacade(self.ert())
+
         # Clear all correlations
         local.clear_correlations(ert)
 
         # Read yml file with specifications
         config_dict = local.read_localisation_config(args)
 
-        # Get all observations from ert instance
-        obs_keys = [
-            facade.get_observation_key(nr)
-            for nr, _ in enumerate(facade.get_observations())
-        ]
+        expand_gen_obs_max_size = get_max_gen_obs_size_for_expansion(config_dict)
+        obs_keys = local.get_obs_from_ert(ert, expand_gen_obs_max_size)
 
         ert_parameters = local.get_param_from_ert(ert.ensembleConfig())
 
@@ -35,6 +34,7 @@ def run(self, *args):
             ert_parameters.to_dict(),
             ert.getLocalConfig(),
             ert.ensembleConfig(),
+            ert.getObservations(),
             ert.eclConfig().getGrid(),
         )
 
@@ -195,6 +195,51 @@ def run(self, *args):
           scalingfactors: [1.0, 0.5, 0.3]
           smooth_ranges: [2,3]
 
+Example 2:
+------------
+In this example the optional keyword **max_gen_obs_size** is specified.
+The value 1000 means that all observation nodes of type GEN_OBS having less
+than 1000 observations are specified in the form::
+
+ nodename:index
+
+where **index** is an integer from 0 to 999.
+All GEN_OBS nodes with more than 1000 observations
+are specified in the form nodename only. The reason not to enable to specify
+individual observations from GEN_OBS of any size is performance e.g. when
+GEN_OBS nodes of seismic data is used.
+
+The first example below (2A) specifies all observations by::
+
+ GENOBS_NODE:*
+
+The second example (2B) has selected a few observations from the
+GENOBS_NODE::
+
+  ["GENOBS_NODE:0","GENOBS_NODE:3","GENOBS_NODE:55"]
+
+Example 2A::
+
+  max_gen_obs_size: 1000
+  log_level:2
+  correlations:
+    - name: CORR1
+       obs_group:
+          add: ["GENOBS_NODE:*"]
+       param_group:
+          add: ["PARAM_NODE:*"]
+
+Example 2B::
+
+  max_gen_obs_size: 100
+  log_level:2
+  correlations:
+    - name: CORR1
+       obs_group:
+          add: ["GENOBS_NODE:0","GENOBS_NODE:3","GENOBS_NODE:55"]
+       param_group:
+          add: ["PARAM_NODE:*"]
+
 
 Keywords
 -----------
@@ -212,6 +257,16 @@ def run(self, *args):
       and make it possible to visualise them. Is only relevant when using
       **field_scale** with methods calculating the scaling factors.
 
+:max_gen_obs_size:
+      Specify the max size of GEN_OBS type of observation nodes that
+      can specify individual observations. Individual observations are specified
+      by nodename:index where index is the observation number in the
+      observation file associated with the GEN_OBS type node.
+      The keyword is optional. If not specified or specified with value 0,
+      this means that observations of type GEN_OBS is specified by
+      nodename only. Individual observations can not be specified in this case
+      which means that all observations in the GEN_OBS node is used.
+
 :correlations:
       List of specifications of correlation groups. A correlation group
       specify a set of observations and a set of model parameters.
@@ -296,6 +351,13 @@ def run(self, *args):
       The nodename represents all field values for all grid cells in the whole
       3D or 2D grid the field belongs to.
 
+      For observations specified with GENERAL_OBSERVATION keyword in ERT config file,
+      it is possible to specify the observations by either *node_name*
+      or *node_name:index*. Default is to specify by *node_name* only which means
+      to include all observation from this ERT identifier.
+      The alternative option is to use the keyword **max_gen_obs_size**
+      described above and specify individual observations by *node_name:index*.
+
 :remove:
       For details see the keyword **add:**. The main purpose of **remove** is to
       have a quick and easy way to specify all parameters or observations
diff --git a/semeio/workflows/localisation/local_script_lib.py b/semeio/workflows/localisation/local_script_lib.py
index 6c7f25b60..4f0390e76 100644
--- a/semeio/workflows/localisation/local_script_lib.py
+++ b/semeio/workflows/localisation/local_script_lib.py
@@ -1,4 +1,5 @@
 # pylint: disable=W0201
+# pylint: disable=C0302
 import math
 import yaml
 import cwrap
@@ -15,13 +16,16 @@
 from ecl.eclfile import Ecl3DKW
 from ecl.ecl_type import EclDataType
 from ecl.grid.ecl_grid import EclGrid
+
 from res.enkf.enums.ert_impl_type_enum import ErtImplType
 from res.enkf.enums.enkf_var_type_enum import EnkfVarType
+from res.enkf import EnkfObservationImplementationType
 
 from semeio.workflows.localisation.localisation_debug_settings import (
     LogLevel,
     debug_print,
 )
+from ert_shared.libres_facade import LibresFacade
 
 
 @dataclass
@@ -170,14 +174,14 @@ def active_index_for_parameter(node_name, param_name, ert_param_dict):
 
 
 def activate_gen_kw_param(
-    model_param_group, node_name, param_list, ert_param_dict, log_level=LogLevel.OFF
+    ministep, node_name, param_list, ert_param_dict, log_level=LogLevel.OFF
 ):
     """
     Activate the selected parameters for the specified node.
     The param_list contains the list of parameters defined in GEN_KW
     for this node to be activated.
     """
-    active_param_list = model_param_group.getActiveList(node_name)
+    active_param_list = ministep.getActiveList(node_name)
     debug_print("Set active parameters", LogLevel.LEVEL2, log_level)
     for param_name in param_list:
         index = active_index_for_parameter(node_name, param_name, ert_param_dict)
@@ -191,7 +195,7 @@ def activate_gen_kw_param(
 
 
 def activate_gen_param(
-    model_param_group, node_name, param_list, data_size, log_level=LogLevel.OFF
+    ministep, node_name, param_list, data_size, log_level=LogLevel.OFF
 ):
     """
     Activate the selected parameters for the specified node.
@@ -199,7 +203,7 @@ def activate_gen_param(
     for the parameter indices to be activated for parameters belonging
     to the specified GEN_PARAM node.
     """
-    active_param_list = model_param_group.getActiveList(node_name)
+    active_param_list = ministep.getActiveList(node_name)
     for param_name in param_list:
         index = int(param_name)
         if index < 0 or index >= data_size:
@@ -564,6 +568,7 @@ def add_ministeps(
     ert_param_dict,
     ert_local_config,
     ert_ensemble_config,
+    ert_obs,
     grid_for_field,
 ):
     # pylint: disable-msg=too-many-branches
@@ -579,17 +584,17 @@ def add_ministeps(
     )
 
     for count, corr_spec in enumerate(user_config.correlations):
+
         ministep_name = corr_spec.name
         ministep = ert_local_config.createMinistep(ministep_name)
         debug_print(
             f"Define ministep: {ministep_name}", LogLevel.LEVEL1, user_config.log_level
         )
 
-        param_group_name = ministep_name + "_param_group"
         obs_group_name = ministep_name + "_obs_group"
         obs_group = ert_local_config.createObsdata(obs_group_name)
 
-        obs_list = corr_spec.obs_group.result_items
+        obs_dict = Parameters.from_list(corr_spec.obs_group.result_items).to_dict()
         param_dict = Parameters.from_list(corr_spec.param_group.result_items).to_dict()
 
         # Setup model parameter group
@@ -780,20 +785,40 @@ def add_ministeps(
                         user_config.log_level,
                     )
 
-        # Setup observation group
-        for obs_name in obs_list:
+        # Setup observation group. For GEN_OBS type
+        # the observation specification can be of the form obs_node_name:index
+        # if individual observations from a GEN_OBS node is chosen or
+        # only obs_node_name if all observations in GEN_OBS is active.
+        obs_type = EnkfObservationImplementationType.GEN_OBS
+        key_list_gen_obs = ert_obs.getTypedKeylist(obs_type)
+        for obs_node_name, obs_index_list in obs_dict.items():
+            obs_group.addNode(obs_node_name)
             debug_print(
-                f"Add obs node: {obs_name}", LogLevel.LEVEL2, user_config.log_level
+                f"Add obs node: {obs_node_name}", LogLevel.LEVEL2, user_config.log_level
             )
-            obs_group.addNode(obs_name)
+            if obs_node_name in key_list_gen_obs:
+                # An observation node of type GEN_OBS
+                if len(obs_index_list) > 0:
+                    active_obs_list = obs_group.getActiveList(obs_node_name)
+                    if len(obs_index_list) > 50:
+                        debug_print(
+                            f"More than 50 active obs for {obs_node_name}",
+                            LogLevel.LEVEL3,
+                            user_config.log_level,
+                        )
 
-        # Setup ministep
-        debug_print(
-            f"Attach {param_group_name} to ministep {ministep_name}",
-            LogLevel.LEVEL1,
-            user_config.log_level,
-        )
+                    for string_index in obs_index_list:
+                        index = int(string_index)
+                        if len(obs_index_list) <= 50:
+                            debug_print(
+                                f"Active obs for {obs_node_name}  index: {index}",
+                                LogLevel.LEVEL3,
+                                user_config.log_level,
+                            )
+
+                        active_obs_list.addActiveIndex(index)
 
+        # Setup ministep
         debug_print(
             f"Attach {obs_group_name} to ministep {ministep_name}",
             LogLevel.LEVEL1,
@@ -973,3 +998,31 @@ def write_qc_parameter(
                 grid.write_grdecl(scaling_kw, file)
             # Increase parameter number to define unique parameter name
             cls.scaling_param_number = cls.scaling_param_number + 1
+
+
+def get_obs_from_ert(ert, expand_gen_obs_max_size):
+    facade = LibresFacade(ert)
+    ert_obs = facade.get_observations()
+    obs_keys = []
+    if expand_gen_obs_max_size == 0:
+        obs_keys = [facade.get_observation_key(nr) for nr, _ in enumerate(ert_obs)]
+        return obs_keys
+
+    for nr, _ in enumerate(ert_obs):
+        key = facade.get_observation_key(nr)
+        impl_type = facade.get_impl_type_name_for_obs_key(key)
+        if impl_type == "GEN_OBS":
+            obs_vector = ert_obs[key]
+            timestep = obs_vector.activeStep()
+            obs_node = obs_vector.getNode(timestep)
+            data_size = obs_node.getSize()
+            if data_size <= expand_gen_obs_max_size:
+                obs_key_with_index_list = [
+                    key + ":" + str(item) for item in range(data_size)
+                ]
+                obs_keys.extend(obs_key_with_index_list)
+            else:
+                obs_keys.append(key)
+        else:
+            obs_keys.append(key)
+    return obs_keys
diff --git a/semeio/workflows/localisation/localisation_config.py b/semeio/workflows/localisation/localisation_config.py
index badd2ea71..52dd5715a 100644
--- a/semeio/workflows/localisation/localisation_config.py
+++ b/semeio/workflows/localisation/localisation_config.py
@@ -355,6 +355,28 @@ def validate_surface_scale(cls, value):
             )
 
 
+class MaxGenObsSize(PydanticBaseModel):
+    """
+    max_gen_obs_size:  Integer >=0. Default: 0
+                             If it is > 0, it defines that all GEN_OBS observations is
+                             expanded into the form nodename:index. The user
+                             must specify GEN_OBS type observations in
+                             the form nodename:index or nodename:* if
+                             all observations for a GEN_OBS node is used.
+                             The max_gen_obs_size value is a threshold value.
+                             If a GEN_OBS node has more observations than
+                             max_gen_obs_size specified by the user,
+                             the obs node is not expanded and the
+                             user also must specify the obs node only by its
+                             nodename, not in expanded form. Typical use of this is
+                             to let nodes containing moderate number of observations
+                             be expanded, while nodes having large number of
+                             observations are not expanded.
+    """
+
+    max_gen_obs_size: Optional[conint(ge=0)] = 0
+
+
 class LocalisationConfig(BaseModel):
     """
     observations:  A list of observations from ERT in format nodename
@@ -367,6 +389,15 @@ class LocalisationConfig(BaseModel):
     log_level:       Integer defining how much log output to write to screen
     write_scaling_factors: Turn on writing calculated scaling parameters to file.
                             Possible values: True/False. Default: False
+    max_gen_obs_size:  Integer defining max size for a GEN_OBS node to
+                            be expanded in the form nodename:index.
+                            If the observation node of type GEN_OBS has more
+                            observations than this number, it can only be specified with
+                            node name which then represents the whole set of
+                            observations for the node.
+                            Possible values: Integers >= 0
+                            Default: 0 which means that GEN_OBS nodes are specified
+                            with node name only.
     """
 
     observations: List[str]
@@ -374,6 +405,7 @@ class LocalisationConfig(BaseModel):
     correlations: List[CorrelationConfig]
     log_level: Optional[conint(ge=0, le=5)] = 1
     write_scaling_factors: Optional[bool] = False
+    max_gen_obs_size: Optional[conint(ge=0)] = 0
 
     @validator("log_level")
     def validate_log_level(cls, level):
@@ -406,3 +438,9 @@ def _check_specification(items_to_add, items_to_remove, valid_items):
         added_items = added_items.difference(removed_items)
     added_items = list(added_items)
     return sorted(added_items)
+
+
+def get_max_gen_obs_size_for_expansion(config_dict):
+    tmp_config = MaxGenObsSize(**config_dict)
+    value = tmp_config.max_gen_obs_size
+    return value
diff --git a/tests/jobs/conftest.py b/tests/jobs/conftest.py
index 75a9de588..489f2657f 100644
--- a/tests/jobs/conftest.py
+++ b/tests/jobs/conftest.py
@@ -40,3 +40,18 @@ def setup_poly_ert(tmpdir, test_data_root):
 
     yield
     os.chdir(cwd)
+
+
+@pytest.fixture()
+def setup_poly_gen_param_ert(tmpdir, test_data_root):
+    cwd = os.getcwd()
+    tmpdir.chdir()
+    test_data_dir = os.path.join(test_data_root, "poly_gen_param")
+    shutil.copytree(test_data_dir, "test_data")
+    os.chdir(os.path.join("test_data"))
+
+    res_config = ResConfig("poly.ert")
+
+    yield res_config
+
+    os.chdir(cwd)
diff --git a/tests/jobs/localisation/test_configs/test_config.py b/tests/jobs/localisation/test_configs/test_config.py
index 76ecbe949..231cbfc46 100644
--- a/tests/jobs/localisation/test_configs/test_config.py
+++ b/tests/jobs/localisation/test_configs/test_config.py
@@ -12,6 +12,25 @@
 
 
 ERT_OBS = ["OBS1", "OBS2", "OBS11", "OBS22", "OBS12", "OBS13", "OBS14", "OBS3"]
+ERT_GEN_OBS_EXPANDED = [
+    "GENOBSA:0",
+    "GENOBSA:1",
+    "GENOBSA:2",
+    "GENOBSB:0",
+    "GENOBSB:1",
+    "GENOBSC:0",
+]
+ERT_GEN_OBS = [
+    "GENOBSA",
+    "GENOBSB",
+    "GENOBSC",
+]
+ERT_SUMMARY_OBS = [
+    "WBP9:OP_1",
+    "WBP9:OP_2",
+    "WBP9:OP_3",
+]
+
 ERT_PARAM = [
     "PARAM_NODE1:PARAM1",
     "PARAM_NODE1:PARAM2",
@@ -141,6 +160,109 @@ def test_simple_config(param_group_add, expected):
     assert sorted(conf.correlations[0].param_group.result_items) == sorted(expected)
 
 
+# Test GEN_OBS expanded into list of individual observations and not expanded.
+# Expansion occurs as long as max_gen_obs_size is larger than the number of obs in
+# the GEN_OBS node. Error will occur if user has specified individual observations
+# and the max_gen_obs_size is less than the number of obs for the GEN_OBS node.
+# Error will also occur if user specify node name only and the number of obs in the
+# node is less than max_gen_obs_size.
+@pytest.mark.parametrize(
+    "obs_group_add, obs_group_remove, ert_gen_obs, max_size_to_expand, expected",
+    [
+        (
+            "GENOBS*",
+            [],
+            ERT_GEN_OBS_EXPANDED,
+            10,
+            [
+                "GENOBSA:0",
+                "GENOBSA:1",
+                "GENOBSA:2",
+                "GENOBSB:0",
+                "GENOBSB:1",
+                "GENOBSC:0",
+            ],
+        ),
+        (
+            ["GENOBSB:*"],
+            ["GENOBSB:0"],
+            ERT_GEN_OBS_EXPANDED,
+            10,
+            ["GENOBSB:1"],
+        ),
+        (
+            ["*"],
+            ["*B:0"],
+            ERT_GEN_OBS_EXPANDED,
+            10,
+            ["GENOBSA:0", "GENOBSA:1", "GENOBSA:2", "GENOBSB:1", "GENOBSC:0"],
+        ),
+        (
+            ["*"],
+            ["*B"],
+            ERT_GEN_OBS,
+            0,
+            ["GENOBSA", "GENOBSC"],
+        ),
+    ],
+)
+def test_gen_obs_config(
+    obs_group_add, obs_group_remove, ert_gen_obs, max_size_to_expand, expected
+):
+    data = {
+        "log_level": 2,
+        "max_gen_obs_size": max_size_to_expand,
+        "correlations": [
+            {
+                "name": "some_name",
+                "obs_group": {
+                    "add": obs_group_add,
+                    "remove": obs_group_remove,
+                },
+                "param_group": {"add": ["PARAM_NODE1:*"]},
+            }
+        ],
+    }
+    conf = LocalisationConfig(observations=ert_gen_obs, parameters=ERT_PARAM, **data)
+    assert sorted(conf.correlations[0].obs_group.result_items) == sorted(expected)
+
+
+@pytest.mark.parametrize(
+    "obs_group_add, obs_group_remove, expected",
+    [
+        (
+            ["WBP9:*"],
+            [],
+            ["WBP9:OP_1", "WBP9:OP_2", "WBP9:OP_3"],
+        ),
+        (
+            ["WBP9:*"],
+            ["WBP9:OP_1", "WBP9:OP_3"],
+            ["WBP9:OP_2"],
+        ),
+    ],
+)
+def test_summary_obs_config(obs_group_add, obs_group_remove, expected):
+    data = {
+        "log_level": 2,
+        "max_gen_obs_size": 10,
+        "correlations": [
+            {
+                "name": "some_name",
+                "obs_group": {
+                    "add": obs_group_add,
+                    "remove": obs_group_remove,
+                },
+                "param_group": {"add": ["PARAM_NODE1:*"]},
+            }
+        ],
+    }
+    conf = LocalisationConfig(
+        observations=ERT_SUMMARY_OBS, parameters=ERT_PARAM, **data
+    )
+    assert sorted(conf.correlations[0].obs_group.result_items) == sorted(expected)
+
+
 @pytest.mark.parametrize(
     "obs_group_add, param_group_add,  param_group_remove, expected_error",
     [
@@ -716,3 +838,130 @@ def test_missing_keyword_errors_method_gaussian_decay():
     }
     with pytest.raises(ValueError, match=expected_error):
         LocalisationConfig(observations=["OBS1"], parameters=["PARAM_NODE1"], **data)
+
+
+def test_missing_param():
+    expected_error = "correlations -> 0 -> param_group -> result_items"
+    data = {
+        "log_level": 2,
+        "correlations": [
+            {
+                "name": "CORR",
+                "obs_group": {
+                    "add": ["OBS1"],
+                },
+                "param_group": {
+                    "add": ["*"],
+                    "remove": ["*"],
+                },
+                "ref_point": [250, 250],
+                "field_scale": {
+                    "method": "gaussian_decay",
+                    "main_range": 1000,
+                },
+            },
+        ],
+    }
+    with pytest.raises(ValueError, match=expected_error):
+        LocalisationConfig(observations=["OBS1"], parameters=["PARAM_NODE1"], **data)
+
+
+def test_missing_obs():
+    expected_error = "correlations -> 0 -> obs_group -> result_items"
+    data = {
+        "log_level": 2,
+        "correlations": [
+            {
+                "name": "CORR",
+                "obs_group": {
+                    "add": ["OBS1"],
+                    "remove": ["OBS1"],
+                },
+                "param_group": {
+                    "add": ["*"],
+                },
+                "ref_point": [250, 250],
+                "field_scale": {
+                    "method": "gaussian_decay",
+                    "main_range": 1000,
+                },
+            },
+        ],
+    }
+    with pytest.raises(ValueError, match=expected_error):
+        LocalisationConfig(observations=["OBS1"], parameters=["PARAM_NODE1"], **data)
+
+
+# User define obs in expanded form
+# The nodes are not expanded since the number of obs
+# are 3,2 and 1 for GENOBSA,GENOBSB, GENOBSC
+# and parameter max_gen_obs_size is 0
+def test_gen_obs_expansion_mismatch1():
+    obs_group_add = [
+        "GENOBSA:0",
+        "GENOBSA:1",
+        "GENOBSA:2",
+        "GENOBSB:0",
+        "GENOBSB:1",
+        "GENOBSC:0",
+    ]
+    param_group_add = ["PARAM_NODE1:*"]
+    max_size_to_expand = 0
+    expected_error = (
+        " ['No match for: GENOBSA:0', 'No match for: GENOBSA:1', "
+        " 'No match for: GENOBSA:2', 'No match for: GENOBSB:0', "
+        " 'No match for: GENOBSB:1', 'No match for: GENOBSC:0'] "
+    )
+    data = {
+        "log_level": 2,
+        "max_gen_obs_size": max_size_to_expand,
+        "correlations": [
+            {
+                "name": "some_name",
+                "obs_group": {
+                    "add": obs_group_add,
+                },
+                "param_group": {
+                    "add": param_group_add,
+                },
+            }
+        ],
+    }
+    with pytest.raises(ValueError, match=expected_error):
+        LocalisationConfig(observations=ERT_GEN_OBS, parameters=ERT_PARAM, **data)
+
+
+# User define obs are not in expanded form.
+# The nodes are expanded since the number of obs
+# are 3,2 and 1 for GENOBSA,GENOBSB, GENOBSC
+# and parameter max_gen_obs_size is larger than equal to 3.
+def test_gen_obs_expansion_mismatch2():
+    obs_group_add = [
+        "GENOBSA",
+        "GENOBSB",
+        "GENOBSC",
+    ]
+    param_group_add = ["PARAM_NODE1:*"]
+    max_size_to_expand = 2
+    expected_error = (
+        "['No match for: GENOBSA', 'No match for: GENOBSB', 'No match for: GENOBSC']"
+    )
+    data = {
+        "log_level": 2,
+        "max_gen_obs_size": max_size_to_expand,
+        "correlations": [
+            {
+                "name": "some_name",
+                "obs_group": {
+                    "add": obs_group_add,
+                },
+                "param_group": {
+                    "add": param_group_add,
+                },
+            }
+        ],
+    }
+    with pytest.raises(ValueError, match=expected_error):
+        LocalisationConfig(
+            observations=ERT_GEN_OBS_EXPANDED, parameters=ERT_PARAM, **data
+        )
diff --git a/tests/jobs/localisation/test_integration.py b/tests/jobs/localisation/test_integration.py
index 029f00321..49fee66a1 100644
--- a/tests/jobs/localisation/test_integration.py
+++ b/tests/jobs/localisation/test_integration.py
@@ -2,7 +2,19 @@
 import yaml
 import pytest
 from res.enkf import EnKFMain, ResConfig
+from ert_shared.libres_facade import LibresFacade
+
 from semeio.workflows.localisation.local_config_script import LocalisationConfigJob
+from semeio.workflows.localisation.localisation_config import (
+    LocalisationConfig,
+    get_max_gen_obs_size_for_expansion,
+)
+from semeio.workflows.localisation.local_script_lib import (
+    get_obs_from_ert,
+    get_param_from_ert,
+    active_index_for_parameter,
+    Parameters,
+)
 
 from xtgeo.surface.regular_surface import RegularSurface
 import xtgeo
@@ -10,6 +22,168 @@
 import itertools
 
 
+def verify_ministep_active_param(
+    corr_spec_list, ert_local_config, ert_ensemble_config, ert_param_dict
+):
+    """
+    Script to verify that the local config matches the specified user config for
+    parameters of type GEN_KW and GEN_PARAM.
+    Reports mismatch if found and silent if OK.
+    Used for test purpose.
+    """
+    from res.enkf.enums.active_mode_enum import ActiveMode
+    from res.enkf.enums.ert_impl_type_enum import ErtImplType
+
+    updatestep = ert_local_config.getUpdatestep()
+    for ministep in updatestep:
+        # User specification
+        corr_spec = get_corr_group_spec(corr_spec_list, ministep.name())
+        param_dict = Parameters.from_list(corr_spec.param_group.result_items).to_dict()
+        if len(param_dict) != ministep.numActiveData():
+            raise ValueError(
+                f"len(param_dict):{len(param_dict)}\n"
+                f"active nodes i ministep:{ministep.numActiveData()} "
+            )
+        print(
+            f"\nMinistep:{ministep.name()}\n"
+            f"Number of parameter nodes:{len(param_dict)}"
+        )
+
+        for node_name, user_spec_param_list in param_dict.items():
+            print(f"Node_name:{node_name} ")
+            print(f"Param list:{user_spec_param_list} ")
+
+            active_list_obj = ministep.getActiveList(node_name)
+            node = ert_ensemble_config.getNode(node_name)
+            impl_type = node.getImplementationType()
+
+            # Check only cases with partly active set of parameter
+            spec_index_list = []
+            if active_list_obj.getMode() == ActiveMode.PARTLY_ACTIVE:
+                if impl_type == ErtImplType.GEN_KW:
+                    for user_param_name in user_spec_param_list:
+                        spec_index_list.append(
+                            active_index_for_parameter(
+                                node_name, user_param_name, ert_param_dict
+                            )
+                        )
+
+                elif impl_type == ErtImplType.GEN_DATA:
+                    for item in user_spec_param_list:
+                        spec_index_list.append(int(item))
+
+                active_index_list = active_list_obj.get_active_index_list()
+                spec_index_list.sort()
+                active_index_list.sort()
+                print(f"Spec index list:{spec_index_list} ")
+                print(f"Ministep has active index list: {active_index_list} ")
+                if len(spec_index_list) != len(active_index_list):
+                    raise ValueError(
+                        f"For ministep: {ministep.name()} the number of "
+                        "active parameters are: "
+                        f"{len(active_index_list)} \n"
+                        "while the specified number of active parameters "
+                        f"are: {len(spec_index_list)}"
+                    )
+                if active_index_list != spec_index_list:
+                    raise ValueError(
+                        f" For ministep: {ministep.name()} and "
+                        f"parameter node: {node_name}:\n"
+                        "Mismatch between specified active parameters "
+                        f"and active parameters in the ministep.\n"
+                        f"Specified: {spec_index_list}\n"
+                        f"In ministep: {active_index_list}\n"
+                    )
+
+
+def verify_ministep_active_obs(corr_spec_list, ert):
+    # pylint: disable=R1702
+    """
+    Script to verify that the local config matches the specified user config for
+    active observations.
+    Reports mismatch if found and silent if OK.
+    Used for test purpose.
+    """
+    from res.enkf.enums.active_mode_enum import ActiveMode
+
+    facade = LibresFacade(ert)
+    ert_obs = facade.get_observations()
+    ert_local_config = ert.getLocalConfig()
+
+    updatestep = ert_local_config.getUpdatestep()
+    for ministep in updatestep:
+        # User specification
+        corr_spec = get_corr_group_spec(corr_spec_list, ministep.name())
+        obs_dict = Parameters.from_list(corr_spec.obs_group.result_items).to_dict()
+
+        # Data from local config, only one obs group in a ministep here.
+        local_obs_data = ministep.getLocalObsData()
+        for obs_node in local_obs_data:
+            key = obs_node.key()
+            impl_type = facade.get_impl_type_name_for_obs_key(key)
+            if impl_type == "GEN_OBS":
+                active_list_obj = obs_node.getActiveList()
+                if active_list_obj.getMode() == ActiveMode.PARTLY_ACTIVE:
+                    obs_vector = ert_obs[key]
+                    # Always 1 timestep for a GEN_OBS
+                    timestep = obs_vector.activeStep()
+                    genobs_node = obs_vector.getNode(timestep)
+                    data_size = genobs_node.getSize()
+                    active_list_obj = obs_node.getActiveList()
+                    active_index_list = active_list_obj.get_active_index_list()
+                    active_index_list.sort()
+                    # From user specification
+                    str_list = obs_dict[key]
+                    spec_index_list = [int(str_list[i]) for i in range(len(str_list))]
+                    spec_index_list.sort()
+                    err = False
+                    for nr, index in enumerate(active_index_list):
+                        if index != spec_index_list[nr]:
+                            err = True
+                    if err:
+                        raise ValueError(
+                            f" For ministep: {ministep.name()} and "
+                            f"observation node: {key}:\n"
+                            "Mismatch between specified active observations and "
+                            "active observations  defined in the ministep.\n"
+                            f"Specified: {spec_index_list}\n"
+                            f"In ministep: {active_index_list}\n"
+                            f"Total number of observations for node {key} "
+                            f"is {data_size}."
+                        )
+
+
+def get_corr_group_spec(correlations_spec_list, name):
+    corr_spec_found = None
+    for corr_spec in correlations_spec_list:
+        if name == corr_spec.name:
+            corr_spec_found = corr_spec
+            break
+    if not corr_spec_found:
+        raise ValueError(
+            f"Can not find correlation group: {name} in user specification."
+        )
+    return corr_spec_found
+
+
+def check_consistency_for_active_param_and_obs(ert, config_dict):
+    expand_gen_obs_max_size = get_max_gen_obs_size_for_expansion(config_dict)
+    obs_keys = get_obs_from_ert(ert, expand_gen_obs_max_size)
+    ert_parameters = get_param_from_ert(ert.ensembleConfig())
+    config = LocalisationConfig(
+        observations=obs_keys,
+        parameters=ert_parameters.to_list(),
+        **config_dict,
+    )
+    verify_ministep_active_param(
+        config.correlations,
+        ert.getLocalConfig(),
+        ert.ensembleConfig(),
+        ert_parameters.to_dict(),
+    )
+    verify_ministep_active_obs(config.correlations, ert)
+
+
 @pytest.mark.parametrize(
     "obs_group_add, param_group_add, expected",
     [
@@ -22,7 +196,7 @@
 )
 def test_localisation(setup_ert, obs_group_add, param_group_add, expected):
     ert = EnKFMain(setup_ert)
-    config = {
+    config_dict = {
         "log_level": 4,
         "correlations": [
             {
@@ -50,7 +224,7 @@ def test_localisation(setup_ert, obs_group_add, param_group_add, expected):
         ],
     }
     with open("local_config.yaml", "w", encoding="utf-8") as fout:
-        yaml.dump(config, fout)
+        yaml.dump(config_dict, fout)
     LocalisationConfigJob(ert).run("local_config.yaml")
     assert ert.getLocalConfig().getMinistep("CORR1").name() == "CORR1"
     assert (
@@ -90,45 +264,134 @@ def test_localisation(setup_ert, obs_group_add, param_group_add, expected):
     assert result == expected_result
 
 
-# This test does not work properly since it is run before initial ensemble is
-# created and in that case the number of parameters attached to a GEN_PARAM node
-# is 0.
-def test_localisation_gen_param(
-    setup_poly_ert,
-):
-    with open("poly.ert", "a", encoding="utf-8") as fout:
-        fout.write(
-            "GEN_PARAM PARAMS_A parameter_file_A INPUT_FORMAT:ASCII "
-            "OUTPUT_FORMAT:ASCII INIT_FILES:initial_param_file_A_%d"
-        )
-    nreal = 5
-    nparam = 10
-    for n in range(nreal):
-        filename = "initial_param_file_A_" + str(n)
-        with open(filename, "w", encoding="utf-8") as fout:
-            for i in range(nparam):
-                fout.write(f"{i}\n")
-
-    res_config = ResConfig("poly.ert")
-    ert = EnKFMain(res_config)
-    config = {
-        "log_level": 2,
+def test_localisation_gen_kw(setup_ert):
+    ert = EnKFMain(setup_ert, verbose=True)
+    config_dict = {
+        "log_level": 4,
+        "max_gen_obs_size": 1000,
         "correlations": [
             {
-                "name": "CORR1",
+                "name": "CORR12",
+                "obs_group": {"add": ["WPR_DIFF_1:0", "WPR_DIFF_1:3"]},
+                "param_group": {
+                    "add": [
+                        "SNAKE_OIL_PARAM:OP1_PERSISTENCE",
+                        "SNAKE_OIL_PARAM:OP1_OCTAVES",
+                    ],
+                },
+            },
+            {
+                "name": "CORR3",
+                "obs_group": {"add": "WPR_DIFF_1:2"},
+                "param_group": {
+                    "add": "SNAKE_OIL_PARAM:OP1_DIVERGENCE_SCALE",
+                },
+            },
+            {
+                "name": "CORR4",
                 "obs_group": {
                     "add": "*",
+                    "remove": ["WPR_DIFF_1:1", "WPR_DIFF_1:0"],
                 },
                 "param_group": {
-                    "add": "*",
+                    "add": "SNAKE_OIL_PARAM:OP1_OFFSET",
+                },
+            },
+            {
+                "name": "CORR5",
+                "obs_group": {"add": "*"},
+                "param_group": {
+                    "add": "SNAKE_OIL_PARAM:OP2_PERSISTENCE",
+                },
+            },
+            {
+                "name": "CORR6",
+                "obs_group": {"add": "*"},
+                "param_group": {
+                    "add": "SNAKE_OIL_PARAM:OP2_OCTAVES",
+                },
+            },
+            {
+                "name": "CORR789",
+                "obs_group": {"add": "*"},
+                "param_group": {
+                    "add": [
+                        "SNAKE_OIL_PARAM:OP2_DIVERGENCE_SCALE",
+                        "SNAKE_OIL_PARAM:OP2_OFFSET",
+                        "SNAKE_OIL_PARAM:BPR_555_PERSISTENCE",
+                    ],
+                },
+            },
+            {
+                "name": "CORR10",
+                "obs_group": {"add": "*"},
+                "param_group": {
+                    "add": "SNAKE_OIL_PARAM:BPR_138_PERSISTENCE",
                 },
             },
         ],
     }
+    with open("local_config_gen_kw.yaml", "w", encoding="utf-8") as fout:
+        yaml.dump(config_dict, fout)
+    LocalisationConfigJob(ert).run("local_config_gen_kw.yaml")
+    check_consistency_for_active_param_and_obs(ert, config_dict)
+
+
+def test_localisation_gen_param_and_gen_obs_expanded(
+    setup_poly_gen_param_ert,
+):
+    """
+    POLY_OBS is a GEN_OBS node with less than 10 observations
+    In this case the GEN_OBS node is expanded and the user specify
+    obs like POLY_OBS:index
+    """
+    ert = EnKFMain(setup_poly_gen_param_ert, verbose=True)
+    fs = ert.getEnkfFsManager().getFileSystem("default_smoother_update")
+    ert.getEnkfFsManager().switchFileSystem(fs)
+    config_dict = {
+        "log_level": 2,
+        "max_gen_obs_size": 10,
+        "correlations": [
+            {
+                "name": "CORR1",
+                "obs_group": {"add": ["POLY_OBS:0", "POLY_OBS:3", "POLY_OBS:4"]},
+                "param_group": {"add": ["COEFFS:COEFF_B", "PARAMS_A"]},
+            },
+        ],
+    }
+    with open("local_config_gen_param.yaml", "w", encoding="utf-8") as fout:
+        yaml.dump(config_dict, fout)
+    LocalisationConfigJob(ert).run("local_config_gen_param.yaml")
+    check_consistency_for_active_param_and_obs(ert, config_dict)
 
-    with open("local_config.yaml", "w", encoding="utf-8") as fout:
-        yaml.dump(config, fout)
-    LocalisationConfigJob(ert).run("local_config.yaml")
+
+def test_localisation_gen_param_and_gen_obs_not_expanded1(
+    setup_poly_gen_param_ert,
+):
+    """
+    POLY_OBS is a GEN_OBS node with less than 10 observations
+    In this case the GEN_OBS node is not expanded since
+    max_gen_obs_size < number of obs in the GEN_OBS node.
+    """
+
+    ert = EnKFMain(setup_poly_gen_param_ert, verbose=True)
+    fs = ert.getEnkfFsManager().getFileSystem("default_smoother_update")
+    ert.getEnkfFsManager().switchFileSystem(fs)
+    config_dict = {
+        "log_level": 2,
+        #        "max_gen_obs_size": 3,
+        "correlations": [
+            {
+                "name": "CORR1",
+                "obs_group": {"add": ["POLY_OBS", "POLY_OBS", "POLY_OBS"]},
+                "param_group": {"add": ["COEFFS:COEFF_B", "PARAMS_A"]},
+            },
+        ],
+    }
+    with open("local_config_gen_param.yaml", "w", encoding="utf-8") as fout:
+        yaml.dump(config_dict, fout)
+    LocalisationConfigJob(ert).run("local_config_gen_param.yaml")
+    check_consistency_for_active_param_and_obs(ert, config_dict)
 
 
 def test_localisation_surf(
@@ -169,7 +432,7 @@ def test_localisation_surf(
 
     res_config = ResConfig("poly.ert")
     ert = EnKFMain(res_config)
-    config = {
+    config_dict = {
         "log_level": 3,
         "correlations": [
             {
@@ -193,7 +456,7 @@ def test_localisation_surf(
     }
 
     with open("local_config.yaml", "w", encoding="utf-8") as fout:
-        yaml.dump(config, fout)
+        yaml.dump(config_dict, fout)
     LocalisationConfigJob(ert).run("local_config.yaml")
 
 
@@ -226,7 +489,6 @@ def test_localisation_field1(
                 values = np.zeros((nx, ny, nz), dtype=np.float32)
                 property_field.values = values + 0.1 * n
                 filename = pname + "_" + str(n) + ".roff"
-                print(f"Write file: {filename}")
                 property_field.to_file(filename, fformat="roff", name=pname)
 
             fout.write(
@@ -237,7 +499,7 @@ def test_localisation_field1(
 
     res_config = ResConfig("poly.ert")
     ert = EnKFMain(res_config)
-    config = {
+    config_dict = {
         "log_level": 3,
         "write_scaling_factors": True,
         "correlations": [
@@ -250,7 +512,7 @@ def test_localisation_field1(
                     "add": ["G1", "G2"],
                 },
                 "field_scale": {
-                    "method": "gaussian_decay",
+                    "method": "exponential_decay",
                     "main_range": 1700,
                     "perp_range": 850,
                     "azimuth": 200,
@@ -295,13 +557,14 @@ def test_localisation_field1(
     }
 
     with open("local_config.yaml", "w", encoding="utf-8") as fout:
-        yaml.dump(config, fout)
+        yaml.dump(config_dict, fout)
     LocalisationConfigJob(ert).run("local_config.yaml")
 
 
 def create_box_grid_with_inactive_and_active_cells(
     output_grid_file, has_inactive_values=True
 ):
+    # pylint: disable=E1120
     nx = 30
     ny = 25
     nz = 3
@@ -344,7 +607,6 @@ def create_box_grid_with_inactive_and_active_cells(
     if has_inactive_values:
         grid.inactivate_outside(polygon, force_close=True)
 
-    print(f" Write file: {output_grid_file}")
     grid.to_file(output_grid_file, fformat="egrid")
     return grid
 
@@ -385,7 +647,6 @@ def create_region_parameter(filename, grid):
             else:
                 values[i, j, k] = 4
     region_param.values = values
-    print(f"Write file: {filename}")
     region_param.to_file(filename, fformat="grdecl", name=region_param_name)
 
 
@@ -414,9 +675,8 @@ def create_field_and_scaling_param_and_update_poly_ert(
                 values = np.zeros((nx, ny, nz), dtype=np.float32)
                 property_field.values = values + 0.1 * n
                 filename = property_name + "_" + str(n) + ".roff"
-                print(f"Write file: {filename}")
                 property_field.to_file(filename, fformat="roff", name=property_name)
-            print(f"Write file: {scaling_filename}\n")
+
             scaling_field.to_file(scaling_filename, fformat="grdecl", name=scaling_name)
 
             fout.write(
@@ -445,7 +705,7 @@ def test_localisation_field2(setup_poly_ert):
 
     res_config = ResConfig("poly.ert")
     ert = EnKFMain(res_config)
-    config = {
+    config_dict = {
         "log_level": 3,
         "write_scaling_factors": True,
         "correlations": [
@@ -533,5 +793,98 @@ def test_localisation_field2(setup_poly_ert):
     }
 
     with open("local_config.yaml", "w") as fout:
-        yaml.dump(config, fout)
+        yaml.dump(config_dict, fout)
     LocalisationConfigJob(ert).run("local_config.yaml")
+
+
+def test_localisation_gen_obs(
+    setup_poly_ert,
+):
+    res_config = ResConfig("poly.ert")
+    ert = EnKFMain(res_config)
+    config_dict = {
+        "log_level": 2,
+        "max_gen_obs_size": 1000,
+        "correlations": [
+            {
+                "name": "CORR1",
+                "obs_group": {
+                    "add": ["POLY_OBS:*"],
+                },
+                "param_group": {
+                    "add": ["*"],
+                },
+            },
+        ],
+    }
+    with open("local_config_gen_obs.yaml", "w", encoding="utf-8") as fout:
+        yaml.dump(config_dict, fout)
+    LocalisationConfigJob(ert).run("local_config_gen_obs.yaml")
+    check_consistency_for_active_param_and_obs(ert, config_dict)
+
+
+@pytest.mark.parametrize(
+    "obs_group_add1, obs_group_remove1, obs_group_add2, obs_group_remove2, expected",
+    [
+        (
+            ["POLY_OBS:0", "POLY_OBS:1", "POLY_OBS:2"],
+            [],
+            ["POLY_OBS:3", "POLY_OBS:4"],
+            ["POLY_OBS:3"],
+            {
+                "CORR1": [0, 1, 2],
+                "CORR2": [4],
+            },
+        ),
+        (
+            ["POLY_OBS:*"],
+            ["POLY_OBS:1*", "POLY_OBS:3"],
+            ["POLY_OBS:3"],
+            ["POLY_OBS:1"],
+            {
+                "CORR1": [0, 2, 4],
+                "CORR2": [3],
+            },
+        ),
+    ],
+)
+def test_localisation_gen_obs2(
+    setup_poly_ert,
+    obs_group_add1,
+    obs_group_remove1,
+    obs_group_add2,
+    obs_group_remove2,
+    expected,
+):
+    res_config = ResConfig("poly.ert")
+    ert = EnKFMain(res_config)
+    config_dict = {
+        "log_level": 2,
+        "max_gen_obs_size": 1000,
+        "correlations": [
+            {
+                "name": "CORR1",
+                "obs_group": {
+                    "add": obs_group_add1,
+                    "remove": obs_group_remove1,
+                },
+                "param_group": {
+                    "add": ["*"],
+                },
+            },
+            {
+                "name": "CORR2",
+                "obs_group": {
+                    "add": obs_group_add2,
+                    "remove": obs_group_remove2,
+                },
+                "param_group": {
+                    "add": ["*"],
+                },
+            },
+        ],
+    }
+    with open("local_config_gen_obs2.yaml", "w", encoding="utf-8") as fout:
+        yaml.dump(config_dict, fout)
+    LocalisationConfigJob(ert).run("local_config_gen_obs2.yaml")
+    check_consistency_for_active_param_and_obs(ert, config_dict)
diff --git a/tests/legacy_test_data/poly_gen_param/POLY_EVAL b/tests/legacy_test_data/poly_gen_param/POLY_EVAL
new file mode 100644
index 000000000..8c0137b18
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/POLY_EVAL
@@ -0,0 +1 @@
+EXECUTABLE poly_eval.py
diff --git a/tests/legacy_test_data/poly_gen_param/README.md b/tests/legacy_test_data/poly_gen_param/README.md
new file mode 100644
index 000000000..04f9998cd
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/README.md
@@ -0,0 +1,63 @@
+## Polynomial curve fitting - An extended version of the minimal model updating case
+
+The main difference between this case and the case in directory poly_normal is that
+intial ensemble is created and saved so that it is possible to use this case in
+localisation script as test case. In addition a new model parameter node is added
+to the ert config file. This parameter node: PARAMS_A is of type GEN_PARAM. The purpose
+is to use this test case in integration tests for parameter nodes of type GEN_PARAM.
+
+###Details about the model:
+A display of a truly minimal model updating case. It is done with a second
+degree polynomial as the _true reality_. The model is `ax^2 + bx + c` where
+`a`, `b` and `c` are the parameters.
+
+### Observed data
+The observed data was generated with the following _Python_ code:
+```
+def p(x):
+     return 0.5*x**2 + x + 3
+
+[(p(x)+random.gauss(0, 0.25*x**2+0.1), 0.25*x**2+0.1) for x in [0, 2, 4, 6, 8]]
+```
+
+This gives us observations (both a value and an uncertainty) for even `x` less
+than 10. These values appear in `poly_obs_data.txt`. Finally, these values are
+represented as an observation in `observations`. Here we give the data a name.
+And we specify that the values that should be used from the `forward_model` is only
+the even ones (the `forward model` spits out the image of the polynomial on the
+range `[0, 9]`). It also specifies that the time step to consider is `0`
+(`RESTART`). We do not really have a time concept in this setup and hence we
+only use `0` as a dummy value. We could of course have considered the values
+feed to the polynomial as time; but that is left as an exercise for the reader.
+
+### Parameters
+As mentioned above `a`, `b` and `c` forms the parameters of the model `ax^2 + bx + c`.
+They are all specified to be uniformly distributed over ranges in
+`coeff_priors` and are sampled by `GEN_KW` and dumped to the forward model
+following the `json`-template in `coeff.tmpl`.
+
+### Forward model
+After the parameters are dumped to the runpath, _forward model_'s are launched
+for each of the realizations. The forward model consists of a single script
+described in `poly_eval.py`, that loads the dumped parameters and outputs the
+values of the polynomial (given the parameters) for integer `x in [0, 10]` to the
+file `poly_0.out`.
+
+The very minimal job description file `POLY_EVAL` just points to the script.
+
+### Loading data
+The configuration specifies a `GEN_DATA` that expects there to be a result file
+`poly_%d.out` for report step `0`. In other words it expects to load data from
+`poly_0.out`, the exact file that the forward model produces.
+
+### Model update
+Then the loaded data is compared to the observed data and the parameters are
+updated accordingly.
+
+### Time
+Although we don't really have a clear concept of time in this case _ERT_
+expects us to have so. Since we have specified that all of our data is for time
+step `0`, we had to create an artificial time map `time_map` that specifies
+that the very first and only report step corresponds to `2006-10-1`. This could
+be any date, so we put it to the date of the first commit of the
+`ensembles/ert` repository on _Github_.
diff --git a/tests/legacy_test_data/poly_gen_param/coeff.tmpl b/tests/legacy_test_data/poly_gen_param/coeff.tmpl
new file mode 100644
index 000000000..e55ade502
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/coeff.tmpl
@@ -0,0 +1,5 @@
+{
+  "a": <COEFF_A>,
+  "b": <COEFF_B>,
+  "c": <COEFF_C>
+}
diff --git a/tests/legacy_test_data/poly_gen_param/coeff_priors b/tests/legacy_test_data/poly_gen_param/coeff_priors
new file mode 100644
index 000000000..6bc38963e
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/coeff_priors
@@ -0,0 +1,3 @@
+COEFF_A NORMAL 0.5 0.5
+COEFF_B NORMAL 1.0 1.0
+COEFF_C NORMAL 2.5 2.5
diff --git a/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_0 b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_0
new file mode 100644
index 000000000..8b1acc12b
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_0
@@ -0,0 +1,10 @@
+0
+1
+2
+3
+4
+5
+6
+7
+8
+9
diff --git a/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_1 b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_1
new file mode 100644
index 000000000..b37ba18a4
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_1
@@ -0,0 +1,10 @@
+0.1
+0.9
+2.1
+3.2
+3.8
+5.05
+6.15
+6.82
+8.03
+8.99
diff --git a/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_2 b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_2
new file mode 100644
index 000000000..8bebfc388
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_2
@@ -0,0 +1,10 @@
+-0.1
+0.99
+2.07
+3.2
+3.94
+4.95
+6.05
+7.07
+7.98
+9.13
diff --git a/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_3 b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_3
new file mode 100644
index 000000000..e55d71dd7
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_3
@@ -0,0 +1,10 @@
+0.01
+1.01
+2.03
+3.07
+4.01
+5
+6.03
+7.09
+8.08
+9.11
diff --git a/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_4 b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_4
new file mode 100644
index 000000000..2f2e5435c
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_4
@@ -0,0 +1,10 @@
+-0.07
+1.09
+1.992
+2.983
+4.08
+5.1
+6.05
+7.1
+8.15
+9.2
diff --git a/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_5 b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_5
new file mode 100644
index 000000000..fe3d1b938
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_5
@@ -0,0 +1,10 @@
+-0.01
+0.991
+2.09
+3.1
+4.09
+5.03
+6.16
+7.23
+8.08
+8.89
diff --git a/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_6 b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_6
new file mode 100644
index 000000000..e63877d4a
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_6
@@ -0,0 +1,10 @@
+0.05
+1.15
+2.2
+3.01
+4.1
+5.01
+6.14
+6.97
+7.88
+8.89
diff --git a/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_7 b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_7
new file mode 100644
index 000000000..25f36a2a0
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_7
@@ -0,0 +1,10 @@
+0.1
+1.2
+2.23
+3.14
+3.84
+4.985
+6.21
+7.09
+8.18
+9.26
diff --git a/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_8 b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_8
new file mode 100644
index 000000000..460920b43
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_8
@@ -0,0 +1,10 @@
+-0.10
+0.891
+1.92
+2.83
+4.13
+5.25
+6.08
+7.16
+7.78
+8.89
diff --git a/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_9 b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_9
new file mode 100644
index 000000000..86d7f1699
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/initial_ensemble/initial_param_file_A_9
@@ -0,0 +1,10 @@
+0.01
+1.07
+2.12
+3.1
+4.23
+5.06
+6.1
+6.87
+7.88
+8.899
diff --git a/tests/legacy_test_data/poly_gen_param/observations b/tests/legacy_test_data/poly_gen_param/observations
new file mode 100644
index 000000000..dff1ae0b5
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/observations
@@ -0,0 +1,6 @@
+GENERAL_OBSERVATION POLY_OBS {
+   DATA       = POLY_RES;
+   INDEX_LIST = 0,2,4,6,8;
+   RESTART    = 0;
+   OBS_FILE   = poly_obs_data.txt;
+};
diff --git a/tests/legacy_test_data/poly_gen_param/poly.ert b/tests/legacy_test_data/poly_gen_param/poly.ert
new file mode 100644
index 000000000..04007fa55
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/poly.ert
@@ -0,0 +1,19 @@
+JOBNAME poly_%d
+
+QUEUE_SYSTEM LOCAL
+QUEUE_OPTION LOCAL MAX_RUNNING 50
+
+RUNPATH poly_out/real_%d/iter_%d
+
+OBS_CONFIG observations
+TIME_MAP time_map
+
+NUM_REALIZATIONS 10
+MIN_REALIZATIONS 1
+
+GEN_KW COEFFS coeff.tmpl coeffs.json coeff_priors
+GEN_PARAM PARAMS_A parameter_file_A INPUT_FORMAT:ASCII OUTPUT_FORMAT:ASCII INIT_FILES:initial_ensemble/initial_param_file_A_%d
+GEN_DATA POLY_RES RESULT_FILE:poly_%d.out REPORT_STEPS:0 INPUT_FORMAT:ASCII
+
+INSTALL_JOB poly_eval POLY_EVAL
+SIMULATION_JOB poly_eval
diff --git a/tests/legacy_test_data/poly_gen_param/poly_eval.py b/tests/legacy_test_data/poly_gen_param/poly_eval.py
new file mode 100755
index 000000000..251a63a6c
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/poly_eval.py
@@ -0,0 +1,19 @@
+#!/usr/bin/env python
+
+import json
+
+
+def _load_coeffs(filename):
+    with open(filename) as f:
+        return json.load(f)
+
+
+def _evaluate(coeffs, x):
+    return coeffs["a"] * x**2 + coeffs["b"] * x + coeffs["c"]
+
+
+if __name__ == "__main__":
+    coeffs = _load_coeffs("coeffs.json")
+    output = [_evaluate(coeffs, x) for x in range(10)]
+    with open("poly_0.out", "w") as f:
+        f.write("\n".join(map(str, output)))
diff --git a/tests/legacy_test_data/poly_gen_param/poly_obs_data.txt b/tests/legacy_test_data/poly_gen_param/poly_obs_data.txt
new file mode 100644
index 000000000..d792b163d
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/poly_obs_data.txt
@@ -0,0 +1,5 @@
+2.8532509308 0.1
+7.20311703432 1.1
+21.3864899107 4.1
+31.5145559347 9.1
+53.5676660405 16.1
diff --git a/tests/legacy_test_data/poly_gen_param/storage/case-log b/tests/legacy_test_data/poly_gen_param/storage/case-log
new file mode 100644
index 000000000..ef269fd76
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/storage/case-log
@@ -0,0 +1,3 @@
+CASE:default           PID:10213     HOST:st-linrgs112.st.statoil.no  TIME:25/11/2021-20.51.33
+CASE:default           PID:1521      HOST:st-linrgs112.st.statoil.no  TIME:29/11/2021-21.36.11
+CASE:default_smoother_update  PID:1521      HOST:st-linrgs112.st.statoil.no  TIME:29/11/2021-21.36.39
diff --git a/tests/legacy_test_data/poly_gen_param/storage/current_case b/tests/legacy_test_data/poly_gen_param/storage/current_case
new file mode 100644
index 000000000..752cee887
--- /dev/null
+++ b/tests/legacy_test_data/poly_gen_param/storage/current_case
@@ -0,0 +1 @@
+default_smoother_update
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Binary files /dev/null and b/tests/legacy_test_data/poly_gen_param/storage/default_smoother_update/files/summary-key-set differ
diff --git a/tests/legacy_test_data/poly_gen_param/time_map b/tests/legacy_test_data/poly_gen_param/time_map
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+2006-10-1
diff --git a/tests/legacy_test_data/poly_gen_param/update_log/0000 b/tests/legacy_test_data/poly_gen_param/update_log/0000
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+===============================================================================================================================
+Report step...: 0000
+Ministep......: ALL_ACTIVE
+-------------------------------------------------------------------------------------------------------------------------------
+                                                         Observed history               |             Simulated data
+-------------------------------------------------------------------------------------------------------------------------------
+  1   : POLY_OBS                                   2.853 +/-            0.100 Active    |             2.396 +/-           2.390
+  2   :   ...                                      7.203 +/-            1.100 Active    |             6.172 +/-           5.412
+  3   :   ...                                     21.386 +/-            4.100 Active    |            14.526 +/-          13.225
+  4   :   ...                                     31.515 +/-            9.100 Active    |            27.457 +/-          25.948
+  5   :   ...                                     53.568 +/-           16.100 Active    |            44.965 +/-          43.498
+===============================================================================================================================