PEPPOL-EN16931-R001: The invoice does not state a Peppol business process identifier (ProfileID),…
What it means
The invoice does not state a Peppol business process identifier (ProfileID), the code that tells the receiving network which business process this document belongs to.
How to fix it
Set the ProfileID (BT-23) to the Peppol business process URN that applies, e.g. 'urn:fdc:peppol.eu:2017:poacc:billing:01:1.0'.