There will be times when an invoice has been created in error, on the wrong project, or when the project was canceled or rescoped. Whatever the reason, ensuring your records are clean and reflects what happened is a simple task. It's worth noting that when you delete an invoice, this action is permanent and can not be undone, or restored
Open the invoice that needs to be deleted, navigate to the Actions button, select Delete Invoice from the drop-down menu.
A pop-up box will ask you to confirm this request, reminding you that this step can not be undone and will remove the invoice from the system permanently.

