{
  "id": "UBL-SR-09",
  "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": "Seller name shall occur maximum once",
  "statement_lang": "en",
  "context": "/ubl:Invoice | /cn:CreditNote",
  "test": "(count(cac:AccountingSupplierParty/cac:Party/cac:PartyLegalEntity/cbc:RegistrationName) <= 1)",
  "meaning": "The seller name shall occur at most once. The statement has no period, says shall, and is shorter than 40 characters. The flag is fatal. The context is the same string as BR-CO-18. The published test counts the seller legal entity registration name. The comparison has a space before <= and a space after it.",
  "fix": "Send at most one seller legal entity registration name.",
  "example_fail": "The seller party has two legal entity registration names.",
  "example_pass": "The seller party has one legal entity registration name, 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-09/",
  "source_retrieved": "2026-10-18",
  "last_verified": "2026-10-18"
}