Cannot cancel delivery remainder on PO lines

Need to cancel Delivery remainder in PO lines. so i went to delivery remainder in Update line tab and canceled quantity but its giving error like “The quantity on the load lines cannot be adjusted based on the source lines quantity change”

Any suggestion is it code error or am i doing it wrong?

What is your AX version? Please always tag it.

Doesn’t look like a code error. Do you have any load lines related to that PO line?

You are dealing with advanced warehousing and you have created a load to help with the inbound process, that load is still open I guess expecting the remaining quantity, review the load.