Hi Vladimir,
Please refer OSS note 137225 - Prod. order: Issuing storage location for component
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. So in your case material in both plants have the storage location defined. So it is selecting accordingly. Make the storage location blank in material master and check the same.
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.
Regards,
R.Brahmankar