Correct erroneous invoices by first issuing a credit note (correction or cancellation invoice) for the erroneous invoice and then creating a new invoice.

1. Go to the  Invoices tab in the side navigation.
2. Right-click the erroneous  Invoice and select "Create credit note".
3. If there are multiple invoices, click on  Create rebooking invoice. All items from the existing invoices are summarised in the rebooking invoice.
4. A  Spreadsheet with a new invoice number and the status "in progress" will open.
5. Select a suitable template by clicking on  Select text template (in the toolbar on the left).
6. A cancellation invoice will open with the address, the ordered items and an invoice number, but no date.
7. To send the invoice as an email attachment, click on  Send document as PDF attachment by email.
8. When prompted, choose between making a Customer print with invoice date or an undated Proof copy.
9. An  email cover letter will open, with the invoice attached in a PDF format.
10. If a Cover letter has already been preset for the spreadsheet template, this cover letter will also appear. If not, select a cover letter template or enter a custom text.
11.  Save the email for sending later or  Send it directly.
12. Change the status of the cancellation invoice and the original invoice to, e.g. "rejected" depending on your company specifications.