{
  "id": "UBL-SR-44",
  "country": "EU",
  "syntax": "ubl",
  "group": "syntax",
  "severity": "fatal",
  "severity_note": "fatal, from the Flag column of the Peppol BIS Billing 3.0 UBL rules index retrieved 2026-10-18.",
  "spec": "Peppol BIS Billing 3.0, May 2026 release, EN 16931 model bound to UBL",
  "statement": "An Invoice may only have one unique PaymentID, but the PaymentID may be used for multiple PaymentMeans",
  "statement_lang": "en",
  "context": "/ubl:Invoice | /cn:CreditNote",
  "test": "count(//cbc:PaymentID[not(preceding::cbc:PaymentID/. = .)]) <= 1",
  "meaning": "An invoice may have only one distinct payment identifier. The statement has no period and says may. It does not say shall. It is 102 characters. The flag is fatal. The context is the same string as BR-CO-18. The published test does not wrap the count in parentheses. It counts distinct PaymentID values and writes = and <= with a space on each side.",
  "fix": "Use one payment identifier, even when several payment means share it.",
  "example_fail": "The invoice has two different payment identifiers.",
  "example_pass": "The invoice has one payment identifier, or none, including when several payment means repeat it.",
  "example_note": "Illustration of the condition in the official statement. Not an example published by the source.",
  "source_url": "https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/UBL-SR-44/",
  "source_retrieved": "2026-10-18",
  "last_verified": "2026-10-18"
}