SAP Message 881031 - Additional info key is still used. Cannot delete.

Diagnosis The selected additional info key is still used inthe REA master data. System Response The additional info key cannot be deleted. Procedure First delete the additional info key from the REA master data. To dothis, choose REA Information Systems -> Assignment -> Article to ->Recycling Partner or Article to ->Packaging (Recycling Partner-Dependent) orPackaging to -> Recycling Partner. Instead of deleting, you can suppress the use of the additional infokey by deactivating it.