diff --git a/definitions/grib1/localConcepts/ecmf/paramIdForConversion.def b/definitions/grib1/localConcepts/ecmf/paramIdForConversion.def
new file mode 100644
index 000000000..67de48733
--- /dev/null
+++ b/definitions/grib1/localConcepts/ecmf/paramIdForConversion.def
@@ -0,0 +1,31 @@
+# Concept paramIdForConversion for ECMWF
+# ECC-1806
+
+# 55 -> 228004
+228004 = {gribTablesVersionNo=128; indicatorOfParameter=55;  centre=98;}
+# 56 -> 235168
+235168 = {gribTablesVersionNo=128; indicatorOfParameter=56;  centre=98;}
+# 130232 -> 235135
+235135 = {gribTablesVersionNo=130; indicatorOfParameter=232; centre=98;}
+# 151163 -> 262104
+262104 = {gribTablesVersionNo=151; indicatorOfParameter=163; centre=98;}
+# 151145 -> 262124
+262124 = {gribTablesVersionNo=151; indicatorOfParameter=145; centre=98;}
+# 172146 -> 235033
+235033 = {gribTablesVersionNo=172; indicatorOfParameter=146; centre=98;}
+# 172147 -> 235034
+235034 = {gribTablesVersionNo=172; indicatorOfParameter=147; centre=98;}
+# 172169 -> 235035
+235035 = {gribTablesVersionNo=172; indicatorOfParameter=169; centre=98;}
+# 172175 -> 235036
+235036 = {gribTablesVersionNo=172; indicatorOfParameter=175; centre=98;}
+# 172176 -> 235037
+235037 = {gribTablesVersionNo=172; indicatorOfParameter=176; centre=98;}
+# 172177 -> 235038
+235038 = {gribTablesVersionNo=172; indicatorOfParameter=177; centre=98;}
+# 172178 -> 235039
+235039 = {gribTablesVersionNo=172; indicatorOfParameter=178; centre=98;}
+# 172179 -> 235040
+235040 = {gribTablesVersionNo=172; indicatorOfParameter=179; centre=98;}
+# 174098 -> 262000
+262000 = {gribTablesVersionNo=174; indicatorOfParameter=98;  centre=98;}
diff --git a/definitions/grib1/localConcepts/ecmf/stepTypeForConversion.def b/definitions/grib1/localConcepts/ecmf/stepTypeForConversion.def
index 60530eddb..25aae31d8 100644
--- a/definitions/grib1/localConcepts/ecmf/stepTypeForConversion.def
+++ b/definitions/grib1/localConcepts/ecmf/stepTypeForConversion.def
@@ -1,8 +1,6 @@
 # Concept stepTypeForConversion for ECMWF
-# set uses the FIRST one
-# get returns the LAST match
 
-# ECC-457: ECMWF Total Precipitation
+# ECC-457: total precipitation
 "accum"={timeRangeIndicator=0;indicatorOfParameter=228;gribTablesVersionNo=128;centre=98;}
 "accum"={timeRangeIndicator=1;indicatorOfParameter=228;gribTablesVersionNo=128;centre=98;}
 "accum"={timeRangeIndicator=10;indicatorOfParameter=228;gribTablesVersionNo=128;centre=98;}
diff --git a/definitions/grib1/paramIdForConversion.def b/definitions/grib1/paramIdForConversion.def
new file mode 100644
index 000000000..8cd3ea212
--- /dev/null
+++ b/definitions/grib1/paramIdForConversion.def
@@ -0,0 +1,3 @@
+# Concept paramIdForConversion
+# See ECC-1806
+0 = {dummy=0;}
diff --git a/definitions/grib1/section.1.def b/definitions/grib1/section.1.def
index 566936ca7..d62300f27 100644
--- a/definitions/grib1/section.1.def
+++ b/definitions/grib1/section.1.def
@@ -327,19 +327,4 @@ meta md5Section1 md5(offsetSection1,section1Length);
 meta md5Product md5(offsetSection1,section1Length,gridDefinition,section1Flags,decimalScaleFactor);
 
 # ECC-1806
-concept_nofail paramIdForConversion(zero) {
-  228004 = { gribTablesVersionNo=128; indicatorOfParameter=55;  centre=98; } # 55 -> 228004
-  235168 = { gribTablesVersionNo=128; indicatorOfParameter=56;  centre=98; } # 56 -> 235168
-  235135 = { gribTablesVersionNo=130; indicatorOfParameter=232; centre=98; } # 130232 -> 235135
-  262104 = { gribTablesVersionNo=151; indicatorOfParameter=163; centre=98; } # 151163 -> 262104
-  262124 = { gribTablesVersionNo=151; indicatorOfParameter=145; centre=98; } # 151145 -> 262124
-  235033 = { gribTablesVersionNo=172; indicatorOfParameter=146; centre=98; } # 172146 -> 235033
-  235034 = { gribTablesVersionNo=172; indicatorOfParameter=147; centre=98; } # 172147 -> 235034
-  235035 = { gribTablesVersionNo=172; indicatorOfParameter=169; centre=98; } # 172169 -> 235035
-  235036 = { gribTablesVersionNo=172; indicatorOfParameter=175; centre=98; } # 172175 -> 235036
-  235037 = { gribTablesVersionNo=172; indicatorOfParameter=176; centre=98; } # 172176 -> 235037
-  235038 = { gribTablesVersionNo=172; indicatorOfParameter=177; centre=98; } # 172177 -> 235038
-  235039 = { gribTablesVersionNo=172; indicatorOfParameter=178; centre=98; } # 172178 -> 235039
-  235040 = { gribTablesVersionNo=172; indicatorOfParameter=179; centre=98; } # 172179 -> 235040
-  262000 = { gribTablesVersionNo=174; indicatorOfParameter=98;  centre=98; } # 174098 -> 262000
-} : long_type;
+concept_nofail paramIdForConversion(zero, "paramIdForConversion.def", conceptsDir2, conceptsDir1) : long_type,read_only;