SAP Message WAHD209 - Conflict with base unit of measure for material &1 (ECC = &2, BW = &3)

Diagnosis
In the SAP system, the base unit of measure &SYST-MSGV2& is used for the
material &SYST-MSGV1&. Whenloading alternative historicaldata (AHD) from SAP BW, however, the unit of measure &SYST-MSGV3& isreturned.
The query must always return the AHD in the base unit of measure usedfor a material in SAP ECC.

System Response
Because of this conflict, the system was unable to transfer the AHD fromSAP BW.

Procedure
INCLUDE ISR_BERECHTIGUNG