Hi Doru, I was looking with Raffael to the definition of the meta model i we might find an inconsistency: You define: FAMIXGlobalVariable>>>parentModule <MSEProperty: #parentModule type: #FAMIXModule opposite: #globalVariables> <MSEComment: 'Module (typically a file) defining the global variable.'> ^ self privateState attributeAt: #parentModule ifAbsentPut: [ nil ] But the opposite globalVariable is not define in FAMIXModule but into FAMIXScopingEntity. So either the pragmas in FAMIXGlobalVariable>>>parentModule became like this: <MSEProperty: #parentModule type: #FAMIXScopingEntity opposite: #globalVariables> <MSEComment: 'Module (typically a file) defining the global variable.'> (In this case the property should be called parentScope not parentModule) or you move to FAMIXModule FAMIXScopingEntity>>>globalVariables <MSEProperty: #globalVariables type: #FAMIXGlobalVariable opposite: #parentScope> <multivalued> <derived> <MSEComment: 'Global variables defined in the scope, if any.'> I would go for the first. Thanks, Fabrizio and Raffael