SAP Message /MAP/AD01063 - Row &1: only enter reasons for change for complete assignments

Diagnosis
Change reasons should only be made if a complete planned or releasedassignment is edited and the dimension values suggested by the systemare to be overwritten manually.
This is not the case for the assignment in line &V1&<(>&<)>V1<(>&<)>.

System Response
The change reason is not accepted.