Peppol: An identifier of a referenced purchase order, issued by the Buyer.An invoice must have buyer reference (BT-10) or purchase order reference.

Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Data type
Document Reference
udt:IdentifierType
Example value
98776
Business terms
BT-13
Rules
Identifier/Error message Flag
PEPPOL-EN16931-R003
A buyer reference or purchase order reference MUST be provided.
fatal