Delivery note packed qty is 0 and can't be changed?

I’m trying to set up Pick Lists and Delivery Notes for my company at the moment and have run into a problem with the Delivery Note. When I create a delivery note from a pick list, the delivery note item table always shows “0” in the Packed Qty column. I also cannot seem to edit this table at all. Why is this happening? The item is in stock and the pick list has the “picked qty” column filled out. Am I missing a step?

Thank you
delivery note

I think, it’s the older version. right?