Hi Nancy,
Thank you for the note: 137225. It is clearly stated as below.
First, the issue storage location of the material to be issued (MARC-LGPRO) is transferred to
the material master from the MRP data if it is filled.
l The system overwrites this value with the issue storage location from the bill of material
(RC29P-LGORT, STPO-LGORT) if it is filled.
l If the operation to which the component is assigned in production order contains a work center
with supply area, the storage location is transferred from this supply area (PVBE-LGORT).
However, this transfer is only carried out if storage location data (MARD) is maintained for
this storage location for the material.