diff --git a/definitions/grib1/localConcepts/ecmf/stepType.def b/definitions/grib1/localConcepts/ecmf/stepType.def
index ae1d35b3b..d8d56f2a4 100644
--- a/definitions/grib1/localConcepts/ecmf/stepType.def
+++ b/definitions/grib1/localConcepts/ecmf/stepType.def
@@ -32,8 +32,3 @@
 "avgas"   = {timeRangeIndicator=128;}
 "avgad"   = {timeRangeIndicator=130;}
 "avgid"   = {timeRangeIndicator=133;}
-
-
-# ECC-457: ECMWF Total Precipitation
-"accum" = {timeRangeIndicator=0;indicatorOfParameter=228;gribTablesVersionNo=128;centre=98;}
-"accum" = {timeRangeIndicator=1;indicatorOfParameter=228;gribTablesVersionNo=128;centre=98;}
diff --git a/definitions/grib1/localConcepts/ecmf/stepTypeForConversion.def b/definitions/grib1/localConcepts/ecmf/stepTypeForConversion.def
new file mode 100644
index 000000000..5b370d16e
--- /dev/null
+++ b/definitions/grib1/localConcepts/ecmf/stepTypeForConversion.def
@@ -0,0 +1,7 @@
+# Concept stepTypeForConversion for ECMWF
+# set uses the FIRST one
+# get returns the LAST match
+
+# ECC-457: ECMWF Total Precipitation
+"accum" = {timeRangeIndicator=0;indicatorOfParameter=228;gribTablesVersionNo=128;centre=98;}
+"accum" = {timeRangeIndicator=1;indicatorOfParameter=228;gribTablesVersionNo=128;centre=98;}
diff --git a/definitions/grib1/section.1.def b/definitions/grib1/section.1.def
index 062dc81c3..5a48e3ebb 100644
--- a/definitions/grib1/section.1.def
+++ b/definitions/grib1/section.1.def
@@ -92,26 +92,25 @@ if ( indicatorOfTypeOfLevel == 101 or
 }
 else
 {
-  unsigned[2] level : can_be_missing,dump;
-  if (indicatorOfTypeOfLevel == 210) {
-    meta marsLevel scale(level,oneConstant,hundred) : read_only;
-	alias mars.levelist = marsLevel;
-  } 
-  alias vertical.level=level;
-  alias vertical.topLevel    = level;
-  alias vertical.bottomLevel = level;
-  alias ls.level=level;
-  alias lev=level;
-
+    unsigned[2] level : can_be_missing,dump;
+    if (indicatorOfTypeOfLevel == 210) {
+        meta marsLevel scale(level,oneConstant,hundred) : read_only;
+        alias mars.levelist = marsLevel;
+    }
+    alias vertical.level=level;
+    alias vertical.topLevel    = level;
+    alias vertical.bottomLevel = level;
+    alias ls.level=level;
+    alias lev=level;
 }
 
-if(	indicatorOfTypeOfLevel == 109 ||
-	indicatorOfTypeOfLevel == 100 ||
-	indicatorOfTypeOfLevel == 110 ||
-	indicatorOfTypeOfLevel == 113 ||
-	indicatorOfTypeOfLevel == 117)
+if( indicatorOfTypeOfLevel == 109 ||
+    indicatorOfTypeOfLevel == 100 ||
+    indicatorOfTypeOfLevel == 110 ||
+    indicatorOfTypeOfLevel == 113 ||
+    indicatorOfTypeOfLevel == 117)
 {
-	  alias mars.levelist = level;
+    alias mars.levelist = level;
 }
 
 unsigned[1] yearOfCentury : edition_specific ;
@@ -144,9 +143,9 @@ codetable[1] subCentre 'grib1/0.[centre].table' : dump;
 if(table2Version >= 128) {
   _if (centre != 98 && subCentre == 98) {
     alias centreForTable2 = subCentre;
-} else {
+  } else {
     alias centreForTable2 = centre;
-}
+  }
 } else {
   alias centreForTable2 = WMO;
 }
@@ -178,15 +177,15 @@ transient setLocalDefinition= 0 : no_copy;
 # Try different values of binaryScaleFactor and decimalScaleFactor to reduce packing error
 transient optimizeScaleFactor = 0;
 
-meta      dataDate            g1date(centuryOfReferenceTimeOfData,yearOfCentury,month,day) : dump;
-meta      year                evaluate(dataDate / 10000) ;
+meta dataDate   g1date(centuryOfReferenceTimeOfData,yearOfCentury,month,day) : dump;
+meta year       evaluate(dataDate / 10000) ;
 
 meta dataTime   time(hour,minute,second) : dump;
 meta julianDay  julian_day(dataDate,hour,minute,second) : edition_specific;
 
 codetable[1] stepUnits 'stepUnits.table' = 1 : transient,dump,no_copy;
 
-concept_nofail stepType (timeRangeIndicator, "stepType.def", conceptsMasterDir, conceptsLocalDirAll)
+concept_nofail stepType (timeRangeIndicator, "stepType.def", conceptsMasterDir, conceptsLocalDirAll);
 
 #alias stepTypeInternal=stepType;
 #alias lengthOfTimeRange=numberIncludedInAverage;
@@ -195,18 +194,18 @@ concept_nofail stepType (timeRangeIndicator, "stepType.def", conceptsMasterDir,
 #alias timeIncrement=zero;
 
 #if (timeRangeIndicator==113) {
-#	alias lengthOfTimeRange=numberIncludedInAverage;
-#	alias indicatorOfUnitForTimeRange=unitOfTimeRange;
-#	alias indicatorOfUnitForTimeIncrement=unitOfTimeRange;
-#	alias timeIncrement=P2;
-#	alias forecastTime=P1;
+#    alias lengthOfTimeRange=numberIncludedInAverage;
+#    alias indicatorOfUnitForTimeRange=unitOfTimeRange;
+#    alias indicatorOfUnitForTimeIncrement=unitOfTimeRange;
+#    alias timeIncrement=P2;
+#    alias forecastTime=P1;
 #}
 
 #if (stepType is "accum") {
-#		transient accumulationRange=P2-P1;
-#		alias lengthOfTimeRange=accumulationRange;
-#		alias forecastTime=P1;
-#		alias indicatorOfUnitForTimeRange=unitOfTimeRange;
+#        transient accumulationRange=P2-P1;
+#        alias lengthOfTimeRange=accumulationRange;
+#        alias forecastTime=P1;
+#        alias indicatorOfUnitForTimeRange=unitOfTimeRange;
 #}
 
 #conversion 1->2
@@ -262,21 +261,20 @@ if(((section1Length > 40) or new() or setLocalDefinition> 0) and deleteLocalDefi
       }
     }
 
-	template_nofail marsKeywords "mars/grib.[stream:s].[type:s].def";
-	#template marsKeywords "mars/grib.[stream:s].[type:s].def";
+    template_nofail marsKeywords "mars/grib.[stream:s].[type:s].def";
+    #template marsKeywords "mars/grib.[stream:s].[type:s].def";
 
   }
   else
-  { 
-	if ( !new() || setLocalDefinition ) {
-		# Other centres
-		pad reservedNeedNotBePresent(12);
-		template_nofail  localDefinition  "grib1/local.[centre:l].def";
+  {
+    if ( !new() || setLocalDefinition ) {
+        # Other centres
+        pad reservedNeedNotBePresent(12);
+        template_nofail  localDefinition  "grib1/local.[centre:l].def";
     
-		section_padding localExtensionPadding : read_only;
-	}
+        section_padding localExtensionPadding : read_only;
+    }
   }
-
 }
 else
 {
@@ -311,4 +309,10 @@ alias time.startStep=startStep;
 alias time.endStep=endStep;
 alias time.stepType=stepType;
 
+# ECC-457: GRIB1 to GRIB2 conversion
+concept_nofail stepTypeForConversion (unknown, "stepTypeForConversion.def", conceptsMasterDir, conceptsLocalDirAll);
+if (stepTypeForConversion is "accum" ) {
+    alias productDefinitionTemplateNumber=eight;
+}
+
 meta md5Section1 md5(offsetSection1,section1Length);
diff --git a/definitions/grib1/stepTypeForConversion.def b/definitions/grib1/stepTypeForConversion.def
new file mode 100644
index 000000000..c8b68e6cd
--- /dev/null
+++ b/definitions/grib1/stepTypeForConversion.def
@@ -0,0 +1,3 @@
+# Concept stepTypeForConversion
+# See ECC-457
+"unknown" = {dummy=0;}
diff --git a/tests/grib_step.sh b/tests/grib_step.sh
index 8c4c7625d..22f18920b 100755
--- a/tests/grib_step.sh
+++ b/tests/grib_step.sh
@@ -94,6 +94,10 @@ ${tools_dir}/grib_set -s indicatorOfUnitOfTimeRange=m $grib2_sample $temp
 unit=`${tools_dir}/grib_get -p indicatorOfUnitOfTimeRange $temp`
 [ "$unit" = "0" ]
 
+# ECC-457
+input=${data_dir}/tp_ecmwf.grib
+stepRange=`${tools_dir}/grib_get -w count=1 -p stepRange,startStep,endStep,stepType $input`
+[ "$stepRange" = "12 12 12 instant" ]
+
 rm -f $temp
 rm -f $grib2File.p8tmp ${grib2File}.tmp x.grib
-