If you need to correct an already sent invoice, you can choose to edit the invoice. You can change all the information on the invoice. The changes made are summarized and displayed before you save and resend the invoice.
A credit invoice will automatically be created to match the original invoice and a new invoice is sent to the customer. The invoices will have different invoice numbers after you edit information but the OCR number will remain the same. Everything is documented in the record history and viewable by both you and the customer int the timeline.