SAP Message WM457 - Assortment & is not a local assortment for a plant

Diagnosis
Local assortments can only be assigned to a local assortment of aplant. You cannot assign them to a general assortment.
Local assortment modules should be an exception. They representmaterials that are to be sold in a specific plant. A restriction istherefore placed on the local assortment.

System Response
Entering a general assortment is not permitted.

Procedure
You can assign the assortment module to the general assortment usingthe transaction "Assignment of the Assortment Module to Assortment"