If you need to cancel a Pre-Order, you'll need to Pick Up the Pre-Order on the iPad Register first. When you Pick Up and complete the transaction on the iPad Register, the Pre-Order becomes a sale transaction.
To cancel the sale transaction on the iPad, head to the Menu > Transactions > Cancel Transaction.
How to Cancel Pre-Orders
Tap on the shortcut menu on the right.
Select ‘Pre-Order’, and choose ‘Pick Up’.
Select the pre-order to pick up by searching the receipt number or customer name.
To pay, tap on the full amount.
Choose the payment method, and the amount tendered.
You have completed the Pick Up!
Now, let's cancel this transaction. Tap on the menu on the left hand side. Select ‘Transactions’.
Search for the transaction that needs to be cancelled. Check that the details of the transaction are correct.
Tap on Cancel Transaction.
A warning message will pop up to let you know that this action cannot be undone. Select ‘Yes’ to confirm the cancellation.