SAP Message VL491 - Confirmation from WMS already performed; You cannot delete item &

Diagnosis
A goods issue or goods delivery was already posted in the decentralizedwarehouse management system for the delivery. Therefore you cannot makeany changes to the delivery that affect the stock update.

System Response
The system does not allow deletion of items.

Procedure
Posting the goods movement is still permitted for the delivery. You canonly cancel the delivery as the result of a business transaction.