If, to change an invoice, you need to issue a credit note rather than void or change an invoice, follow these steps: 1. Issue the credit note in your accounting system 2. Issue a new invoice on the deal in HubSpot to replace the old one (the old one will show as "paid"). This can be done by duplicating the old invoice or clicking 'Autofill' everything to generate a new invoice. This will show the previous invoice as credited. The new invoice (if required) will sync with your accounting system.