ResourceAssociationSets '{0}' and '{1}' have a ResourceAssociationSetEnd referring to the same EntitySet '{2}' through the ...

ResourceAssociationSets '{0}' and '{1}' have a ResourceAssociationSetEnd referring to the same EntitySet '{2}' through the same AssociationType. Make sure that if two or more AssociationSets refer to the same AssociationType, the ends must not refer to the same EntitySet. For CLR context, this could happen if multiple entity sets have entity types that have a common ancestor and the ancestor has a property of derived entity types.