Creating Free-of-Charge Deliveries 
Creating Free-of-Charge Deliveries
Procedure
Use the same procedure that you use for
creating sales orders. Use order type FD in the standard system. 
When you create a free-of-charge delivery, you must enter a value in the Order reason field or the system informs you that the document is incomplete.
Result
After you have
released the free-of-charge delivery, you can create the delivery.