{
  "id": "UBL-SR-40",
  "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": "Buyer trade name shall occur maximum once",
  "statement_lang": "en",
  "context": "/ubl:Invoice | /cn:CreditNote",
  "test": "(count(cac:AccountingCustomerParty/cac:Party/cac:PartyName/cbc:Name) <= 1)",
  "meaning": "The buyer trade name shall occur at most once. The statement has no period and says shall. It is 41 characters. The flag is fatal. The context is the same string as BR-CO-18. The published test counts the buyer party name. The count comparison has a space before <= and a space after it.",
  "fix": "Send at most one buyer trade name.",
  "example_fail": "The invoice has two buyer party names.",
  "example_pass": "The invoice has one buyer party 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-40/",
  "source_retrieved": "2026-10-18",
  "last_verified": "2026-10-18"
}