diff --git a/plugins/org.etsi.mts.tdl.tx/src/org/etsi/mts/tdl/TDLtx.xtext b/plugins/org.etsi.mts.tdl.tx/src/org/etsi/mts/tdl/TDLtx.xtext
index 5c8a95c4ee644ecfd6618ba34325d7b48718f415..d4691c9318c57abc05177d1a58592b3db9bebf0b 100644
--- a/plugins/org.etsi.mts.tdl.tx/src/org/etsi/mts/tdl/TDLtx.xtext
+++ b/plugins/org.etsi.mts.tdl.tx/src/org/etsi/mts/tdl/TDLtx.xtext
@@ -311,12 +311,12 @@ EnumDataType returns tdl::EnumDataType:
 DataUse returns tdl::DataUse:
     //NOTE: No name, annotations or comments
     //Remove static and dynamic eventually in favour of the sub-rules 
-    DataElementUse
+    =>DataElementUse
 //    | LiteralValueUse
 //    | SpecialValueUse
 //    | VariableUse
 //    | PredefinedFunctionCall
-    | (StaticDataUse)
+    | =>(StaticDataUse)
     | (DynamicDataUse)
 ;
 
@@ -332,9 +332,17 @@ fragment ParameterBindingFragment returns tdl::DataUse:
 
 ParameterBinding returns tdl::ParameterBinding:
     parameter=[tdl::Parameter|Identifier]
+//    ('.' parameter+=[tdl::Parameter|Identifier])*
+    ParameterReductionFragment
     '=' dataUse=DataUse
 ;
 
+fragment ParameterReductionFragment returns tdl::ParameterBinding:
+    (->reduction+=CollectionReference)?
+    ('.' reduction+=MemberReference)*
+;
+
+
 MemberReference returns tdl::MemberReference:
     member=[tdl::Member|Identifier] 
     (->'[' collectionIndex=DataUse ']')?