diff --git a/definitions/grib2/local/ecmf/section4_extras.def b/definitions/grib2/local/ecmf/section4_extras.def
index 0d70c1ac9..49351d8b9 100644
--- a/definitions/grib2/local/ecmf/section4_extras.def
+++ b/definitions/grib2/local/ecmf/section4_extras.def
@@ -5,7 +5,7 @@ if (centre is "ecmf" or datasetForLocal is "era6") {
  concept modelName(unknown, "modelNameConcept.def", conceptsMasterDir, conceptsLocalDirAll): no_copy, dump, read_only;
 
  if (modelName isnot "unknown") {
-    concept modelVersion(unknown, "modelVersionConcept_[modelName].def", conceptsMasterDir, conceptsLocalDirAll): no_copy, dump, read_only;
+    concept modelVersion(unknown, "modelVersionConcept.[modelName].def", conceptsMasterDir, conceptsLocalDirAll): no_copy, dump, read_only;
     # alias ls.model = modelName;
     # alias mars.model = modelName;
  }
diff --git a/definitions/grib2/localConcepts/ecmf/modelVersionConcept_AIFS.def b/definitions/grib2/localConcepts/ecmf/modelVersionConcept.AIFS.def
similarity index 100%
rename from definitions/grib2/localConcepts/ecmf/modelVersionConcept_AIFS.def
rename to definitions/grib2/localConcepts/ecmf/modelVersionConcept.AIFS.def
diff --git a/definitions/grib2/localConcepts/ecmf/modelVersionConcept.IFS.def b/definitions/grib2/localConcepts/ecmf/modelVersionConcept.IFS.def
new file mode 100644
index 000000000..2bbe0ee20
--- /dev/null
+++ b/definitions/grib2/localConcepts/ecmf/modelVersionConcept.IFS.def
@@ -0,0 +1,18 @@
+'cy50r3' = { generatingProcessIdentifier = 163; }
+'cy50r2' = { generatingProcessIdentifier = 162; }
+'cy50r1' = { generatingProcessIdentifier = 161; }
+'cy49r3' = { generatingProcessIdentifier = 160; }
+'cy49r2' = { generatingProcessIdentifier = 159; }
+'cy49r1' = { generatingProcessIdentifier = 158; }
+'cy48r3' = { generatingProcessIdentifier = 157; }
+'climatedt' = { generatingProcessIdentifier = 156; }
+'cy48r2' = { generatingProcessIdentifier = 155; }
+'cy48r1' = { generatingProcessIdentifier = 154; }
+'cy47r3' = { generatingProcessIdentifier = 153; }
+'cy47r2' = { generatingProcessIdentifier = 152; }
+'cy47r1' = { generatingProcessIdentifier = 151; }
+'cy46r1' = { generatingProcessIdentifier = 150; }
+'cy45r1' = { generatingProcessIdentifier = 149; }
+'cy43r3' = { generatingProcessIdentifier = 148; }
+'cy43r1' = { generatingProcessIdentifier = 147; }
+'cy41r2' = { generatingProcessIdentifier = 146; }
\ No newline at end of file
diff --git a/definitions/grib2/localConcepts/ecmf/modelVersionConcept_IFS.def b/definitions/grib2/localConcepts/ecmf/modelVersionConcept_IFS.def
deleted file mode 100644
index 8445b7489..000000000
--- a/definitions/grib2/localConcepts/ecmf/modelVersionConcept_IFS.def
+++ /dev/null
@@ -1,10 +0,0 @@
-'cy49r1' = { generatingProcessIdentifier = 155; } 
-'cy48r1' = { generatingProcessIdentifier = 154; }
-'cy47r3' = { generatingProcessIdentifier = 153; }
-'cy47r2' = { generatingProcessIdentifier = 152; }
-'cy47r1' = { generatingProcessIdentifier = 151; }
-'cy46r1' = { generatingProcessIdentifier = 150; }
-'cy45r1' = { generatingProcessIdentifier = 149; }
-'cy43r3' = { generatingProcessIdentifier = 148; }
-'cy43r1' = { generatingProcessIdentifier = 147; }
-'cy41r2' = { generatingProcessIdentifier = 146; }
diff --git a/definitions/grib2/localConcepts/era6/modelVersionConcept_AIFS.def b/definitions/grib2/localConcepts/era6/modelVersionConcept.AIFS.def
similarity index 100%
rename from definitions/grib2/localConcepts/era6/modelVersionConcept_AIFS.def
rename to definitions/grib2/localConcepts/era6/modelVersionConcept.AIFS.def
diff --git a/definitions/grib2/localConcepts/era6/modelVersionConcept_IFS.def b/definitions/grib2/localConcepts/era6/modelVersionConcept.IFS.def
similarity index 100%
rename from definitions/grib2/localConcepts/era6/modelVersionConcept_IFS.def
rename to definitions/grib2/localConcepts/era6/modelVersionConcept.IFS.def