Index: mttroot/mtt/bin/trans/mtt_units.sh
==================================================================
--- mttroot/mtt/bin/trans/mtt_units.sh
+++ mttroot/mtt/bin/trans/mtt_units.sh
@@ -38,15 +38,19 @@
 	exit 1
 esac
 
 get_unit()
 {
-  factor=`units $2 $3 | head -1 | sed 's/\*//'`
-  if [ `echo $factor | wc -w` = "1" ]; then
-    echo $factor
+  if [ "$2" == "none" ]; then
+      echo 1
   else
-    echo $1_UNIT_ERROR unit $2 not compatible with domain ${domain}
+      factor=`units $2 $3 | head -1 | sed 's/\*//'`
+      if [ `echo $factor | wc -w` = "1" ]; then
+	  echo $factor
+      else
+	  echo $1_UNIT_ERROR unit $2 not compatible with domain ${domain}
+      fi
   fi
 }
 ## Check effort and flow for comptability + find factor
 effort_factor=`get_unit EFFORT $effort $base_effort`
 flow_factor=`get_unit FLOW $flow $base_flow`