How to change the form of payment for a sale
You can change the form of payment of a sale after it was validated.
To do so, go to Till/Daily cash/Sales and click on the receipt you want to modify.
Once the transaction opened, you can click on the cross next to the amount.
Then, you can select another form of payment.
For example, here, I replaced credit card by cash.
Once you are done, don't forget to save.