SAP Message W5160 - Quantity conversion from &3 to &4 for material &1 from res. &2 failed

Diagnosis Quantity conversion from &V3& to &V4& for material &V1& from reservationV2 has failed. Procedure Check the reservation that was transferred to the BAPI, and whether thematerial master record for the material affected contains the correctlymaintained conversion factors for alternative units of measure.