{
  "id": "BRD-026",
  "slug": "brd-026",
  "title": "An alternate identifier needs its type alongside it",
  "statement": "Where altBusinessId is supplied, altBusinessIdType must be one of DUNS, GIIN, LEI or NONE.",
  "rationale": "The alternate identifier is optional and strengthens verification when it is present, but a number with no type is a number nobody can look up — the registry rejects the pair rather than storing half of it. It usually happens when a DUNS number is added helpfully, from a procurement record that never carried a type field.",
  "layer": "BRAND",
  "layerSlug": "brand",
  "object": "brand.alt_business_id + brand.alt_business_id_type",
  "severity": "LOW",
  "detectability": [
    "DETERMINISTIC"
  ],
  "failureClass": "RETRY_FIELD",
  "authorities": [
    "TCR"
  ],
  "codes": [
    {
      "provider": "TCR",
      "code": "501",
      "remediable": true
    }
  ],
  "applicabilityText": "Applies to every 10DLC registration.",
  "universal": true,
  "remediation": "Set altBusinessIdType to the register the alternate number came from — DUNS for Dun & Bradstreet, GIIN for the IRS FATCA register, LEI for a legal entity identifier. If you do not have one, clear both fields rather than sending a bare number. Done when either both fields are populated or neither is.",
  "example": "alt_business_id: 123456789 · alt_business_id_type: DUNS",
  "notes": "The field is optional and validated only when present, which is why this is LOW rather than BLOCKING — but it will reject the whole brand submission, so it costs a round trip like any other field error.",
  "phase": "approval",
  "automated": true,
  "url": "https://ekas.io/rules/10dlc/brand/brd-026/",
  "markdown": "https://ekas.io/rules/10dlc/brand/brd-026.md",
  "registry": "https://ekas.io/rules/10dlc/",
  "updated": "2026-07-25",
  "licence": "CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/"
}