Diagnosis
Entity types that the system references ashierarchy attributes may only have externalkey assignments. However, this is not the case for entity type &V2&,which the system references as a hierarchy attribute for thenode entity type &V3& in the hierarchy ofentity type &V4&.

System Response
The system cannot activate the data model.

Procedure
Change the key assignment type for entity type &V2& or reference adifferent entity type for the additional entity type &V3& in thehierarchy for entity type &V4&.