Under Procurement and sourcing parameters > Price > Trade agreement Evaluation

remove the manual entry

Go back to Purchase order and when changing Delivery date, system will not prompt the update order lines for "update prices and discounts entered manually or by external document" for new Purchase Orders.

However, for old Purchase Orders, the prompt is still happening.

System should not prompt the "update prices and discounts entered manually or by external document" for both new Purchase Order and old Purchase Order