SAP Message VW658 - Delivery split not possible since shipment & already completed

Diagnosis
You have attempted to execute a delivery split for deliveries, but atleast one of these deliveries is in a shipment that has already beencompleted (shipment number &V1&). It is not possible to execute a splitfor deliveries that are already included in completed shipments.

System Response
The system does not carry out the delivery split.

Procedure
Revoke the selection of deliveries in shipment &V1& and start thedelivery split with the remaining deliveries again.