Error “General message: Invoice number 'number' is already used in finance for 'relation number' in To export bookings / errors”

This message may occur when the option 'Copy the invoice number of purchase invoices to the invoice number field in AFAS' is enabled. This option will fill not only the AFAS document number but also the AFAS invoice number field of purchase invoices with the invoice number from Zenvoices. If this option is disabled, AFAS will determine the invoice number itself.

Please note: AFAS uses different field names compared to Zenvoices for the fields invoice number and document number. The Zenvoices invoice number field is called document number in AFAS and the Zenvoices document number field is called invoice number in AFAS. The AFAS invoice number field may therefore only be used once per administration.

Solution: Go to Manage / Environment / Administrations and click 'Edit'. Then go to the tab AFAS and disable 'Copy the invoice number of purchase invoices to the invoice number field in AFAS'. The booking will most likely be able to be exported again afterwards.