How can I correct / edit a document afterwards? (TQ00497)

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In this case you must cancel the document (for example an invoice). Once a document has been closed, the law does not allow it to be manipulated afterwards.

If you have written an invoice with a customer number, you can find it via Sales -> Documents -> Invoices and click on the button "Write credit memo" to first clear the incorrect invoice.

Afterwards you can also find this credit memo under Sales -> Documents -> Credit memos and use the button "Write invoice" to avoid having to enter all data manually. At this point you can change the invoice amount.

If you have written the invoice without customer number, you have to create the credit note manually via Sales -> Documents -> Credit note and then click on the button "Create new".