SAP Message WM536 - You have not selected any material groups

Diagnosis
You wish to assign a plant to an assortment. This plant has a referenceplant, however, which is already assigned to the assortment. The plantyou have entered is already assigned to the assortment via thereference plant.

System Response
You cannot assign the plant to the assortment.

Procedure
This plant is already assigned via the reference plant, therefore youdo not need to reassign it.