PEPPOL-EN16931-R080
Only one project reference is allowed on document level
error: the document is invalid
Peppol documentation ↗
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-creditnote:CreditNote
Test
(count(cac:AdditionalDocumentReference[cbc:DocumentTypeCode='50']) <= 1)
Checked with Peppol BIS Billing 3.0 Invoice, Peppol BIS Billing 3.0 Credit Note