SAP Message V1138 - Planning allocation cannot be carried out for material &

Diagnosis
Planning material &V2& (plant &V3&) for material &V1& entered in itemV4 is momentarily blocked by another transaction.

System Response
The system cannot carry out the transfer of requirements nor check ifthe assignment for planning is possible. It therefore skips theseprocessing steps.

Procedure
After you have verified that material &V2& (plant &V3&) is unblockedyou must initiate the assignment check and the transfer of requirementsmanually to complete the processing correctly. You do this by callingup the function 'Item availability' in the 'Edit' menus on the overviewor item screen.