SAP Message VL380 - Unit of measure & in item & is not a proportion/product unit of measure

Diagnosis
The unit of measure of the item is flagged as aproportion / product unit.

System Response
Conversion of this unit of measure into the base unit ofmeasure or the stockkeeping unit mustbe calculated using the batch.
Here the system ascertained that the unit of measure was changed from aproportion or product unit into an alternative unit ofmeasure.

Procedure
Check the material's unit of measure.