When looking at the help function for picking lists you help function states "Everything on an order is included on the picking list, even service and free text items." This is untrue. The picking list does not produce a line for goods if you have zero in stock. It will if say you need 10 and you have 5 in stock, however if you need 5 and there are zero in stock then it just does not print.
It would be helpful to be able to see this on the same picking list.
It won't print if the line is unallocated but it does include if it is allocated (allow negative stock on).
Can you help us understand why you want the information on the picking list in the circumstances where the items isn't available to pick?