Diagnosis
You want to allocate the BOM to plant &V2&.
Item &V3& of the BOM contains a material for which materialrequirements for repetitive manufacturing and continuous flowproduction are planned using distribution key &V1&.
However, this distribution key is not defined in plant &V2&.

Procedure
You can only allocate the BOM to plant &V2& if the distribution key isdefined in this plant.