Would like the Inventory order line focus to move when using the cursor to tab down/up

Currently, when posting items on the IO screens, because of how Hyundai does their invoicing, I have to scroll line by line to confirm pricing so the invoices match. So, when I'm matching costs, it is much quicker to cursor down and enter the quantity in the posted field. However, the blue highlighted bar doesn't move with the cursor. This makes it very difficult to track what you are doing and increases risk of error.