It is possible to clear or reset a transaction that has not yet been paid for.
In the Sale screen, tap the transaction total $ amount that appears at the bottom of the left pane.
A popup appears displaying the transaction subtotals, discounts (if applicable), taxes and total.
Tap the Discard Sale button.
A confirmation popup appears.
Do one of the following:
To clear the transaction, tap Yes. The transaction cancels and returns to a blank Sale screen.
OR
To cancel the operation, return to the Sale screen and continue the transaction, tap No.