Voiding, not deleting
If a payment was recorded by mistake, void it rather than trying to make it disappear. A voided payment stays in the record marked as void, and any invoice it was applied to goes back to outstanding for that amount.
Void a payment
Open the payment's receipt and choose Void this payment. You'll be asked for a reason — this is required, since a void changes what a patient owes and should always have an explanation attached.
If the payment covered more than one invoice
If the payment was applied across several invoices, voiding it returns the amount to outstanding on every one of them, not just a single invoice.
After it's voided
The payment amount shows with a strikethrough and a void reason on its receipt, so it's clearly marked wherever it's reviewed later. Take the correct payment afterwards if the invoice still needs to be paid.