Do you recognize this?
You've created an invoice and sent it to the accountant but forgot to include the customer's VAT number on the invoice.
When you try to make the adjustment, you receive a notification that it's no longer possible because the invoice has already been sent to the accountant. Now, you're wondering if you can still make changes.
You can do this by going to the customer file and entering the VAT number there. The program will automatically fill in the missing information on the invoice.
Easy, right? ;)