SAP Message WTADDI512 - Document & for status update is not available

Diagnosis The status of additionals document &V1& is to be changes using the"ChangeStatus" method for the "SalesAdditionalsReq" business object.This change is not possible as doucment &V1& cannot be found. System Response The system cannot change the document status. Procedure Check the document number. Check also if the document has already beenarchived.