As my project requirement, in the delivery after picking and packing (handling units created) we want to change the delivery quantity and picking quantity. System is taking the quantity if it is more than the existing quantity, subsequently we can do packing. But if the quantity is less than the existing quantity which is already packed it is saying that 'the quantity is already been packed, and quantity cannot be changed". If we do unpacking then it is accepting. But we want do it without unpacking. Is it possible. Awaiting your helpful responses.