User Exits for Delivery Orders 
Use
With this customer function, you can control how the system copies packing proposals into the delivery order.
When you mark the flag E_COPY in this user exit, the system copies existing packing proposals from scheduling agreements to the delivery order for items that do not have proposals. The system does this even if you have not maintained the Data transfer ShUn (data transfer shipping unit) field in Customizing for Shipping.
If you leave this flag blank, the system does not copy packing proposals from the scheduling agreement under any circumstances.
Activate this customer function by setting the flag E_ACTIVE.