diff --git a/definitions/grib2/section.4.def b/definitions/grib2/section.4.def
index f73231b27..1069fb09c 100644
--- a/definitions/grib2/section.4.def
+++ b/definitions/grib2/section.4.def
@@ -128,6 +128,14 @@ if (paramId >= 140000 && paramId < 141000 &&
 }
 
 template timeproc "grib2/timeproc.def";
-alias mars.timeproc = timeproc ;
+#alias mars.timeproc = timeproc ;
+if ( timeproc is "unknown" || timeproc is "point-in-time" || timeproc is "none"){
+# transient timeproc_alias = timeproc ;
+ transient timeprocendstep = endStep;
+ #meta timeprocendstep sprintf("%s(%d)",timeproc,endStep);
+} else {
+ #transient timeprocendstep = endStep;
+ meta timeprocendstep sprintf("%s(%d)",timeproc,endStep);
+}
 
 meta md5Section4 md5(offsetSection4,section4Length);
diff --git a/definitions/grib2/timeproc.def b/definitions/grib2/timeproc.def
index 9c596f355..153b1637a 100644
--- a/definitions/grib2/timeproc.def
+++ b/definitions/grib2/timeproc.def
@@ -1,4 +1,5 @@
 concept timeproc {
+ "unknown" = { dummy = 1; }
  # either instantaneous data or processing is specified by mars stream
  "point-in-time"    = {stepType="instant";}
  "point-in-time"    = {stream="swmm"; numberOfTimeRange=1;}
diff --git a/definitions/mars/grib.edmm.fc.def b/definitions/mars/grib.edmm.fc.def
index 5d94b1664..bd7390003 100644
--- a/definitions/mars/grib.edmm.fc.def
+++ b/definitions/mars/grib.edmm.fc.def
@@ -20,7 +20,9 @@ alias monthlyVerificationTime = validityTime;
 if (class is "em" || class is "e2" || class is "ea" || class is "ep" ||
     class is "rd" || class is "mc" || class is "et" || class is "l5")
 {
-   alias mars.step = endStep;
+   #alias mars.step = endStep;
+   meta stepInterval sprintf("%s",timeprocendstep);
+    alias mars.step = stepInterval;
 }
 else
 {
diff --git a/definitions/mars/grib.edmm.ia.def b/definitions/mars/grib.edmm.ia.def
index 601cee6df..346039382 100644
--- a/definitions/mars/grib.edmm.ia.def
+++ b/definitions/mars/grib.edmm.ia.def
@@ -1,4 +1,6 @@
 # class e4
-alias mars.step = endStep;
+#alias mars.step = endStep;
+meta stepInterval sprintf("%s",timeprocendstep);
+alias mars.step = stepInterval;
 alias mars.number=perturbationNumber;
 
diff --git a/definitions/mars/grib.edmo.fc.def b/definitions/mars/grib.edmo.fc.def
index dda3104a0..32de59906 100644
--- a/definitions/mars/grib.edmo.fc.def
+++ b/definitions/mars/grib.edmo.fc.def
@@ -2,7 +2,9 @@
 meta verificationDate       g1verificationdate(dataDate, dataTime, endStep) : read_only;
 meta monthlyVerificationDate g1monthlydate(verificationDate) : dump,no_copy;
 alias mars.date            = monthlyVerificationDate;
-alias mars.step            = endStep;
+#alias mars.step            = endStep;
+meta stepInterval sprintf("%s",timeprocendstep);
+alias mars.step = stepInterval;
 
 meta verificationYear          evaluate(verificationDate/10000);
 meta monthlyVerificationYear   evaluate(monthlyVerificationDate/10000);
diff --git a/definitions/mars/grib.edmo.ssd.def b/definitions/mars/grib.edmo.ssd.def
index e82cd8bb7..da9f305cc 100644
--- a/definitions/mars/grib.edmo.ssd.def
+++ b/definitions/mars/grib.edmo.ssd.def
@@ -2,7 +2,9 @@
 
 meta  verificationDate   g1verificationdate(dataDate, dataTime, startStep) : read_only;
 alias mars.date        = verificationDate;
-alias mars.step        = endStep;
+#alias mars.step        = endStep;
+meta stepInterval sprintf("%s",timeprocendstep);
+alias mars.step = stepInterval;
 
 # Only ERA15 has time and step 
 if(class != 3) { 
diff --git a/definitions/mars/grib.eefo.fp.def b/definitions/mars/grib.eefo.fp.def
index 8697a1110..bf6e82911 100644
--- a/definitions/mars/grib.eefo.fp.def
+++ b/definitions/mars/grib.eefo.fp.def
@@ -4,7 +4,9 @@
 
 if(startStep == endStep)
 {
-	alias mars.step   = endStep;
+	#alias mars.step   = endStep;
+	meta stepInterval sprintf("%s",timeprocendstep);
+    alias mars.step = stepInterval;
 }
 else
 {
@@ -12,7 +14,9 @@ else
 	{
 		if(startStep == endStep - 24)
 		{
-			alias mars.step   = endStep;
+			#alias mars.step   = endStep;
+			meta stepInterval sprintf("%s",timeprocendstep);
+    		alias mars.step = stepInterval;
 		}
 		else
 		{
diff --git a/definitions/mars/grib.eefo.pf.def b/definitions/mars/grib.eefo.pf.def
index df5f41102..45f105a36 100644
--- a/definitions/mars/grib.eefo.pf.def
+++ b/definitions/mars/grib.eefo.pf.def
@@ -1,2 +1,4 @@
-alias mars.step   = endStep;
+#alias mars.step   = endStep;
+meta stepInterval sprintf("%s",timeprocendstep);
+alias mars.step = stepInterval;
 alias mars.number = perturbationNumber;
diff --git a/definitions/mars/grib.efas.fu.def b/definitions/mars/grib.efas.fu.def
index f29fdfff5..1b21b1b7c 100644
--- a/definitions/mars/grib.efas.fu.def
+++ b/definitions/mars/grib.efas.fu.def
@@ -1,7 +1,9 @@
 # EFAS Fill-up
 
 # ECC-701
-alias mars.step = endStep;
+#alias mars.step = endStep;
+meta stepInterval sprintf("%s",timeprocendstep);
+alias mars.step = stepInterval;
 
 alias mars.date = dateOfForecast;
 alias mars.time = timeOfForecast;
diff --git a/definitions/mars/grib.efas.go.def b/definitions/mars/grib.efas.go.def
index eb09fe436..c03f9d05d 100644
--- a/definitions/mars/grib.efas.go.def
+++ b/definitions/mars/grib.efas.go.def
@@ -1,7 +1,9 @@
 # EFAS Gridded observations
 
 # ECC-701
-alias mars.step = endStep;
+#alias mars.step = endStep;
+meta stepInterval sprintf("%s",timeprocendstep);
+alias mars.step = stepInterval;
 
 alias mars.date = dateOfForecast;
 alias mars.time = timeOfForecast;
diff --git a/definitions/mars/grib.efas.sfo.def b/definitions/mars/grib.efas.sfo.def
index 8660063d7..f5d1873d8 100644
--- a/definitions/mars/grib.efas.sfo.def
+++ b/definitions/mars/grib.efas.sfo.def
@@ -2,7 +2,9 @@
 # Water Balance
 
 # ECC-701
-alias mars.step = endStep;
+#alias mars.step = endStep;
+meta stepInterval sprintf("%s",timeprocendstep);
+alias mars.step = stepInterval;
 
 alias mars.date = dateOfForecast;
 alias mars.time = timeOfForecast;
diff --git a/definitions/mars/grib.efcl.go.def b/definitions/mars/grib.efcl.go.def
index a0c9e2ed9..96ff69b91 100644
--- a/definitions/mars/grib.efcl.go.def
+++ b/definitions/mars/grib.efcl.go.def
@@ -1,7 +1,9 @@
 # EFAS climatology Gridded observations
 
 # ECC-701
-alias mars.step = endStep;
+#alias mars.step = endStep;
+meta stepInterval sprintf("%s",timeprocendstep);
+alias mars.step = stepInterval;
 
 alias mars.date  = dateOfModelVersion;
 alias mars.time  = dataTime;
diff --git a/definitions/mars/grib.efcl.sfo.def b/definitions/mars/grib.efcl.sfo.def
index 868be2fc6..a6121cb07 100644
--- a/definitions/mars/grib.efcl.sfo.def
+++ b/definitions/mars/grib.efcl.sfo.def
@@ -2,7 +2,9 @@
 # Water Balance
 
 # ECC-701
-alias mars.step = endStep;
+#alias mars.step = endStep;
+meta stepInterval sprintf("%s",timeprocendstep);
+alias mars.step = stepInterval;
 
 alias mars.date  = dateOfModelVersion;
 alias mars.time  = dataTime;
diff --git a/definitions/mars/grib.enfo.fp.def b/definitions/mars/grib.enfo.fp.def
index 8697a1110..56f0f6fa9 100644
--- a/definitions/mars/grib.enfo.fp.def
+++ b/definitions/mars/grib.enfo.fp.def
@@ -5,6 +5,8 @@
 if(startStep == endStep)
 {
 	alias mars.step   = endStep;
+	meta stepInterval sprintf("%s",timeprocendstep);
+    alias mars.step = stepInterval;
 }
 else
 {
@@ -13,7 +15,8 @@ else
 		if(startStep == endStep - 24)
 		{
 			alias mars.step   = endStep;
-		}
+			meta stepInterval sprintf("%s",timeprocendstep);
+			alias mars.step = stepInterval;		}
 		else
 		{
 			transient patch_precip_fp = 24;
diff --git a/definitions/mars/grib.enfo.pf.def b/definitions/mars/grib.enfo.pf.def
index df5f41102..45f105a36 100644
--- a/definitions/mars/grib.enfo.pf.def
+++ b/definitions/mars/grib.enfo.pf.def
@@ -1,2 +1,4 @@
-alias mars.step   = endStep;
+#alias mars.step   = endStep;
+meta stepInterval sprintf("%s",timeprocendstep);
+alias mars.step = stepInterval;
 alias mars.number = perturbationNumber;
diff --git a/definitions/mars/grib.ewmm.fc.def b/definitions/mars/grib.ewmm.fc.def
index ed1cf7d98..add5207f2 100644
--- a/definitions/mars/grib.ewmm.fc.def
+++ b/definitions/mars/grib.ewmm.fc.def
@@ -16,7 +16,9 @@ alias monthlyVerificationTime = validityTime;
 if (class is "em" || class is "e2" || class is "ea" || class is "ep" ||
     class is "rd" || class is "mc" || class is "et" || class is "l5")
 {
-   alias mars.step = endStep;
+   #alias mars.step = endStep;
+   meta stepInterval sprintf("%s",timeprocendstep);
+   alias mars.step = stepInterval;
 }
 else
 {
diff --git a/definitions/mars/grib.mnth.fc.def b/definitions/mars/grib.mnth.fc.def
index fc25f40af..502c50cda 100644
--- a/definitions/mars/grib.mnth.fc.def
+++ b/definitions/mars/grib.mnth.fc.def
@@ -15,7 +15,9 @@ alias monthlyVerificationTime = validityTime;
 if (class is "em" || class is "e2" || class is "ea" || class is "ep" ||
     class is "rd" || class is "mc" || class is "et" || class is "l5")
 {
-   alias mars.step = endStep;
+   #alias mars.step = endStep;
+   meta stepInterval sprintf("%s",timeprocendstep);
+   alias mars.step = stepInterval;
 }
 else
 {
diff --git a/definitions/mars/grib.oper.fc.def b/definitions/mars/grib.oper.fc.def
index 1ece3366b..a7c81e0cf 100644
--- a/definitions/mars/grib.oper.fc.def
+++ b/definitions/mars/grib.oper.fc.def
@@ -1,5 +1,6 @@
 if (levtype is "o2d" || levtype is "o3d") {
    alias mars.step = stepRange;
 } else {
-   alias mars.step = endStep;
+    meta stepInterval sprintf("%s",timeprocendstep);
+    alias mars.step = stepInterval;
 }
diff --git a/definitions/mars/grib.oper.pf.def b/definitions/mars/grib.oper.pf.def
index 48f64b0d4..238dd719a 100644
--- a/definitions/mars/grib.oper.pf.def
+++ b/definitions/mars/grib.oper.pf.def
@@ -1,7 +1,9 @@
 if (levtype is "o2d" || levtype is "o3d") {
    alias mars.step = stepRange;
 } else {
-   alias mars.step = endStep;
+   #alias mars.step = endStep;
+   meta stepInterval sprintf("%s",timeprocendstep);
+   alias mars.step = stepInterval;
 }
 
 alias mars.number = perturbationNumber;
\ No newline at end of file