PEPPOL-EN16931-R001

Explanation

PEPPOL and XRechnung require the business process the invoice belongs to. It tells the recipient's system how to process the invoice. The value is normally set by the invoicing software; for ordinary billing it is urn:fdc:peppol.eu:2017:poacc:billing:01:1.0.

How to fix

Ask the seller for a corrected invoice that states the business process, usually urn:fdc:peppol.eu:2017:poacc:billing:01:1.0. This usually comes from the seller's invoicing software, not from data entry.