SAP Message WVMI052 - Key figure &1 cannot be used as comparison field

Diagnosis
The comparison field contains thecomparison quantityalready sent to the vendor. This is updated when the quantity is sentin the IDoc.
The key figure you entered is not suitable as a comparison field.Comparison fields must be assigned to the data element LFAMNG(comparison quantity for vendor information). The informationstructures S083 and S130 in the standard system containcomparison fields.

Procedure
Enter a valid key figure for a comparison field or leave the fieldempty.