SAP Message AO097 - WBS elem. &1 is already assigned to approp. request &2 - correct

Diagnosis You want to assign WBS element &V1& to appropriation request &V3&. WBSelement &V1& is already assigned to appropriation request &V2&. You can only assign it to one appropriation request. System Response The assignment is not allowed. Procedure Remove your entry, or enter a different top WBS element.