SAP Message 8B318 - Unit of measure &1 cannot be converted to &2 for material &3

Diagnosis To calculate certain taxes (e.g. 'IPI Pauta' or 'Sub.Trib.') inBrazilian tax calculation, you have to convert using various units ofmeasure. This conversion is not possible using the units of measure/material combination you have specified. Procedure Maintain the conversion rules for the units of measure/materialcombination specified or use other units of measure for this particularbusiness transaction.