SAP Message WM373 - Material & not listed for assortment / customer & per &

Diagnosis
You cannot use the material in the order item as it has not been listedusing SAP Retail assortment control, or the listing is incomplete.
This check is only carried out if an exclusion check is defined for theorder type, if you work with listing conditions and if the function isperformed in the foreground.

System Response
You cannot use the material in this order.

Procedure
Create the Retail listing or do not use the order item.