- 9 -15. Explanation Of Correction KeysERROR CORRECTUsed to take off last item before CASH key has been pressed. Onlytakes off last sale item.REFUNDUsed to clear any item before CASH key has been pressed. Pressrefund key then press preset price department, or press REFUND key,enter amount to be refunded then department.CANCELCancels whole transaction.% DISCOUNTUsed to register a % off discount. Enter amount then press % key.MINUS KEYUsed to register dollar discounts. Enter $ amount then ā keyCASH OUTUsed to enter cash out sales. Enter amount and press CASH OUT key,is made separately from a sale transaction