How To Void An Invoice
To void an invoice, open the "Edit Invoice" screen for the invoice you wish to void, navigate to the bottom of the screen, and click the "Void This Invoice" button.
CAUTION: Voiding an invoice will delete all of the events associated with that invoice from the Scheduler, and this action is not reversible. If a payment is applied to the invoice before the invoice is voided, the payment will become an open payment after the invoice is voided.