Please clarify on what is meant by shippment instruction, where iexactly it is used and what is the importance of this?
As I explained in my earlier post, the shipping instructions are entered in Delivery Document.(mostly VL01N).
There is no separate T Code for shipping Instructions.
In delivery you click on GOTO
You could configure the deliveries such that whenever you save the delivery it will print out the shipping instructions.
Let me know if you want more details.
Please reward points if helpful.