diff --git a/docs/design/source/testcasedev.rst b/docs/design/source/testcasedev.rst
index a6961176d..20999967d 100755
--- a/docs/design/source/testcasedev.rst
+++ b/docs/design/source/testcasedev.rst
@@ -146,7 +146,7 @@ The second function is to export a wrapper FMU that utilizes the signal exchange
 
 4. Add one output for every Read block found named :code:`<block_instance_path>_y`.  Assign :code:`<block_instance_path>_y` the unit, descriptions, min/max, and other signal attribute data specified by the Read block.
 
-5. For Overwrite blocks, connect :code:`<block_instance_path>_u` to :code:`<block.instance.path>.u`, :code:`<block_instance_path>_activate` to :code:`<block.instance.path>.activate`, and :code:`<block_instance_path>_y` to :code:`<block.instance.path>.y`.
+5. For Overwrite blocks, connect :code:`<block_instance_path>_u` to :code:`<block.instance.path>.uExt.y`, :code:`<block_instance_path>_activate` to :code:`<block.instance.path>.activate.y`, and :code:`<block_instance_path>_y` to :code:`<block.instance.path>.y`.
 
 6. For Read blocks, connect :code:`<block_insance_path>_y` to :code:`<block.instance.path>.y`.
 
diff --git a/releasenotes.md b/releasenotes.md
index 0312ed2ca..70e8e291f 100644
--- a/releasenotes.md
+++ b/releasenotes.md
@@ -11,6 +11,7 @@ Released on xx/xx/xxxx.
 - Specify the Python version (3.7) used for building the wrapper to execute the example JavaScript controllers in the unit test. This is for [#594](https://github.com/ibpsa/project1-boptest/issues/594).
 - Allow simulations and forecast to work across the end of the year to the next year. This is for [#239](https://github.com/ibpsa/project1-boptest/issues/239).
 - Pin base Docker image to ``linux/x86_64`` platform. This is for [#608](https://github.com/ibpsa/project1-boptest/issues/608).
+- Correct typo in design documentation about connecting inputs to overwrite blocks in wrapper model. This is for [#601](https://github.com/ibpsa/project1-boptest/issues/601).
 
 ## BOPTEST v0.5.0
 
diff --git a/testing/utilities.py b/testing/utilities.py
index 881f18ff3..ffe765bcf 100644
--- a/testing/utilities.py
+++ b/testing/utilities.py
@@ -749,35 +749,35 @@ def test_invalid_forecast_parameters(self):
                                    'horizon': 'foo',
                                    'interval': 300}
         payload = requests.put('{0}/forecast'.format(self.url),
-                               data=forecast_parameters_ref)
+                               json=forecast_parameters_ref)
         self.compare_error_code(payload, "Invalid non-numeric horizon in forecast request did not return 400 message.")
         # Try setting non-numeric interval
         forecast_parameters_ref = {'point_names':forecast_points,
                                    'horizon': 3600,
                                    'interval': 'foo'}
         payload = requests.put('{0}/forecast'.format(self.url),
-                               data=forecast_parameters_ref)
+                               json=forecast_parameters_ref)
         self.compare_error_code(payload, "Invalid non-numeric interval in forecast request did not return 400 message.")
         # Try setting negative horizon
         forecast_parameters_ref = {'point_names':forecast_points,
                                    'horizon': -3600,
                                    'interval': 300}
         payload = requests.put('{0}/forecast'.format(self.url),
-                               data=forecast_parameters_ref)
+                               json=forecast_parameters_ref)
         self.compare_error_code(payload, "Invalid negative horizon in forecast request did not return 400 message.")
         # Try setting negative interval
         forecast_parameters_ref = {'point_names':forecast_points,
                                    'horizon': 3600,
                                    'interval': -300}
         payload = requests.put('{0}/forecast'.format(self.url),
-                               data=forecast_parameters_ref)
+                               json=forecast_parameters_ref)
         self.compare_error_code(payload, "Invalid negative interval in forecast request did not return 400 message.")
         # Try setting invalid point name
         forecast_parameters_ref = {'point_names':['foo'],
                                    'horizon': 3600,
                                    'interval': 300}
         payload = requests.put('{0}/forecast'.format(self.url),
-                               data=forecast_parameters_ref)
+                               json=forecast_parameters_ref)
         self.compare_error_code(payload, "Invalid point_names in forecast request did not return 400 message.")
 
     def test_invalid_scenario(self):