In order to edit an invoice, click on the Edit option for the unapproved invoices, or click on Unlock and edit option in the invoice menu. (2)
Define and edit the invoice information.

Deleting an invoice is only enabled for the last one created so that it does not stop the numbering sequence.
Reverse invoices can no longer be unlocked.
The process of edit is like the creation of a new invoice.
Click on SAVE button or press F9 keyboard key to save the changes, or click on the CANCEL button to ignore changes.