When a cancellation transaction is required due to a product return or an error during the sales, if the payment transaction has not been started, it can be corrected by clicking the cancel (iptal) key. For sales cancellation and corrections, the function (fonksiyon) key is pressed first. Then the cancel key is clicked, and the product amount, which is requested to be returned, is entered. The relevant part of the product to be canceled is selected to complete the cancellation transaction.
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