SAP Message 29207 - Multiple BOM already exists for material & &

Diagnosis You want to allocate the BOM for material &V1& to plant &V2&. However,a multiple BOM for material &V1& already exists in plant &V2&. Procedure You see this warning message because you can only link material &V1& inplant &V2& to alternatives, which are identified by the same internalBOM number.