SAP Message VL354 - Quantity change not permitted; &2 &3 are packed in shipment &1

Diagnosis
V2 v3 are already packed in shipment v1. the delivery quantitycannot be reduced for the quantity that is packed.

Procedure
The delivery item must be unpacked using shipment processing before youcan make the desired quantity change.

500028Error when checking the packed batch split quantity
198802Delivery quantity less than packed quantity shipmnt
558252Delivery after packing in trans. no longer changeable