SAP Message 61225 - Conversion between units of measure &1 / &2 for material &3 not possible

Diagnosis
The system has attempted to convert the requirement quantity formaterial &V3& from unit of measure &V1& to unit of measure &V2&.However, an error has occurred.

System Response
The conversion had to be terminated.

Procedure
Check the units of measure and the factors for converting the material.