Asking the customer to go back to the aisle and find another item is not a viable solution! How long would that take?
The code might be damaged, so you should type the code manually.
▷ Read the numbers, usually located under the UPC / barcode.
▷ Type it attentively.
▷ Check the product on the screen.
Check out this video to see how it works. It takes less than 2 min!
Always double-check the item and the price when you enter the code manually. Better safe than sorry!