As long as customer invoices are not posted (closed), they can be deleted. However, once these are completed, only cancellation is possible.
Procedure
Switch to the Customer Invoices menu and find the desired invoice. If the invoice is already closed, you must change the search to “Advanced search”.
Then click on “Delete” in the mask, the system decides independently whether it performs a deletion or a cancellation.
Difference “Cancellation” vs. “Delete
The difference is that when you delete, the document is deleted. The invoice number will not be assigned again. But is “lost”.
When you cancel, the system creates a cancellation document. this balances the account. The cancellation document contains exactly the same amounts only reversed.