SAP Message USMD1064 - Data model &1: Define a "qualifying" relationship for entity type &2

Diagnosis
Entity types with storage and use type 4
must be used as to-entity types in at least one relationshipwith the relationship type Qualifying when the cardinality 1:N isused. This requirement is not fulfilled.

System Response
The data model is not saved or activated.

Procedure
Create at least one relationship with the relationship typeQualifying in which the entity type is used as the To-EntityType.