Message SAP WG055 - Unit & sent is not ISO unit or cannot be converted to a SAP unit

Diagnosis The unit of measure &V1& sent is not an ISO unit of measure. Thereforeit cannot be converted into the SAP unit of measure. No corresponding entry is entered in the conversion table. System Response The GR quantity unit is forwarded unconverted. Procedure Maintain the unit of measurement table if you want a conversion orsend the correct units of measure.