You need to cancel an invoice which is a duplicate, should not have been created, or is a test order.
QuickBooks Online (QBO)
- Void the invoice in QBO and the invoice will be updated to a VOID status in the admin console
- If you delete the invoice while processing (not yet saved in the admin console) the invoice number can be reused
- If you delete an invoice after it has already been processed, you must manually Void it in the admin console as well
Note: Deleting an invoice does not update the admin console, if the invoice already exists in the admin console, and you delete it in QBO, you must void it in the admin console to remove it from reports.