Receiving Items on a GRN: Default Quantity of 0

When creating a GRN, have the quantities on a GRN default to “0” instead of the number on the PO, so we can scan in/manually count what’s received. Currently if there are items backordered or missing, you have to carefully look through the GRN and drop them or manually change the numbers. If this process is missed, the items get received and inventory will be off. Ideally, the quantities will be "0", and the receiver can scan in or manually add the item as they are removed from the box, and quantity received will actually update as they receive stuff. Then, items not received will show as 0 and can get dropped or looked into.