Important: An invoice or Credit note can only be delete if it has not been emailed or posted
Navigate to the Invoice Ledger screen
Locate the invoice you wish to delete
Click on the Delete button
The system will present the below window
The system will not allow an invoice to be deleted without a Reason being supplied
Important: By default the "Delete Transaction" box is unticked. If you enable this option and delete the invoice it will also delete all the transactions associated with that invoice
Once an invoice has been deleted, the associated transactions will be available to be edited (assuming they were not delete with the invoice).