How To Fix WM451 - Assortment no. & has already been used for a customer of a retail plant

SAP Error Message - Details

• Message type: E = Error

• Message class: WM - IS-R Assortments

• Message number: 451

• Message text: Assortment no. & has already been used for a customer of a retail plant

What causes this issue?

You wish to create a new assortment. The assortment number has,
however, already been used as a retail plant number.

System Response

The system will not allow you to use the same number.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.