PEPPOL-EN16931-R003-SG

A buyer reference or purchase order reference MUST be provided.

error: the document is invalid

What the rule checks

As the rule set's publisher wrote it. The rule runs on every element the context matches, and fails where the test is false; the validator reports the line of that element.

Context
/ubl:Invoice | /cn:CreditNote
Test
cbc:BuyerReference or cac:OrderReference/cbc:ID

Checked with PINT SG Invoice, PINT SG Credit Note