SAP Message XU042 - Unit of measure & is not a product un. Qty stored is being recalculated.

Diagnosis
You have entered a quantity in alternative units of measure andstockkeeping units for a material with product units. The alternativeunit of measure entered is not a product unit. The conversion factorbetween stockkeeping unit and this alternative unit of measure cannotbe changed.

System Response
The quantity in stockkeeping units is calculated from the quantity youentered in alternative units of measure. The quantity you entered instockkeeping units is lost.

Procedure
The conversion factor between the alternative unit of measure enteredand the stockkeeping unit can onlky be changed in the material master.Alternatively, you can define this alternative unit of measure as aproduct unit in the material master.

Caution
Changes in the material master can result in inconsistencies in thematerial stock.