{
  "id": "BR-52",
  "country": "EU",
  "syntax": "ubl",
  "group": "document",
  "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": "Each Additional supporting document (BG-24) shall contain a Supporting document reference (BT-122).",
  "statement_lang": "en",
  "context": "cac:AdditionalDocumentReference",
  "test": "normalize-space(cbc:ID) != ''",
  "meaning": "Each Additional supporting document (BG-24) must contain a Supporting document reference (BT-122). The message says \"shall contain\", not \"shall contain the\", and it starts with \"Each\". It ends with a period. The context is an additional document reference. The published test checks that cbc:ID is not blank. The comparison is != '' with a space.",
  "fix": "Put a non-blank supporting document reference (BT-122) on each additional supporting document.",
  "example_fail": "An additional document reference has no identifier, or that identifier is blank.",
  "example_pass": "That document reference identifier contains a non-empty value.",
  "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/BR-52/",
  "source_retrieved": "2026-10-18",
  "last_verified": "2026-10-18"
}