The SP command is used to specify the price of a product at the time of scanning.

The syntax for the command is '[price]SP[SKU][enter]' where '[price]' is the 'special price' for the product with SKU '[SKU]'. The price will be multiplied by 0.01 as the cash command does.

If you are using the touch screen interface you should enter the price, click 'SP' and scan the item.