SAP Message V4296 - Schedule line is already ordered - you need to create a new schedule line

Diagnosis You tried to increase the required quantity of an item or schedule lineto &V1& &V3&. However, &V2& &V3& or this item or schedule line havealready been ordered. System Response The system does not allow the quantity to be increased. Procedure Change the quantity in the input field back to what is was and press'ENTER', or press the red X icon (Cancel, F12). If you want to increase the required quantity, enter a new requestedschedule line, with the required quantity, for the item in the scheduleline screen.

373585	Increase order quantity in ALE third-party order
445451	Quantity change for third-party and individual PO
206452	Quantity change in ordered third-party order