{
  "id": "UBL-SR-34",
  "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": "Invoice line note shall occur maximum once",
  "statement_lang": "en",
  "context": "cac:InvoiceLine | cac:CreditNoteLine",
  "test": "(count(cbc:Note) <= 1)",
  "meaning": "The invoice line note shall occur at most once. The statement has no period and says shall. It is 42 characters. The flag is fatal. The context is an invoice line or a credit note line. The published test counts cbc:Note. The count comparison has a space before <= and a space after it.",
  "fix": "On an invoice line or a credit note line, send at most one note.",
  "example_fail": "An invoice line has two notes.",
  "example_pass": "An invoice line has one note, or none.",
  "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-34/",
  "source_retrieved": "2026-10-18",
  "last_verified": "2026-10-18"
}