SAP Message PV535 - Resource type &1 could not be deleted

Diagnosis You are attempting to delete resource type &V1& from plan version &V2&.The system is currently unable to delete the data from the database. This is a system error which should not occur. System Response When RH_DELETE_OBJECT was called, it caused exception &V3& to occur.The data was not deleted from the database. Procedure Try again later.