diff --git a/src/main/jastadd/Ros2Rag.relast b/src/main/jastadd/Ros2Rag.relast
index fb737a8cb950588c404f71181f2bb42c0077beb5..75c8df8f37ba76167600bc452932497fe401258f 100644
--- a/src/main/jastadd/Ros2Rag.relast
+++ b/src/main/jastadd/Ros2Rag.relast
@@ -10,7 +10,4 @@ rel TokenSyncDefinition.token -> TokenComponent;
 ReadFromMqttDefinition : TokenSyncDefinition;
 WriteToMqttDefinition  : TokenSyncDefinition;
 
-MappingDefinition ::= <ID> <Content> ;
-
-rel MappingDefinition.from -> TypeDecl;
-rel MappingDefinition.to -> TypeDecl;
+MappingDefinition ::= <ID> From:JavaTypeUse To:JavaTypeUse <Content> ;