You'd need one of the back office systems to do that.

Simple. But you need to talk to your dealer really.

You've probably got something set up under "Non PLU Table" which is causing it to fear the price from the barcode. Ask your dealer about this, and if they can't help then find a decent dealer who can.

You can't - that is the sort of thing that only an ICR dealer can set up for you. Had to delete my old account as it refused to let me post and the site owner refuses to reply to my messages despite...