Diagnosis
You want to allocate the BOM to plant &V3&. The BOM contains a KANBANmaterial (item &V4&), for which supply area &V2& and issue locationV1 are defined.

System Response
The system checks which supply areas and issue locations are defined inplant &V2&.

Procedure
Issue location &V1& is not supported for supply area &V2& in plantV3, so you cannot allocate the bom to plant v2.