SAP Message /NFM/CA302 - Document &, material &: Conversion error from & to &

Diagnosis
In document &V1& the PO quantity for material &V2& is specified in &V3&
. An error occurred wjem converting this unit into the base unit ofmeasure &V4&.

System Response
The quantities cannot be processed correctly.

Procedure
Check the material master of material &V2& to find out whetherconversion of the unit &V3& is maintained correctly.