{
  "id": "XBC-001",
  "slug": "xbc-001",
  "title": "Sole proprietor brands may only run the sole proprietor use case",
  "statement": "A SOLE_PROPRIETOR brand must register its campaign under the SOLE_PROPRIETOR use case; standard campaign types are unavailable to that tier.",
  "rationale": "The sole proprietor tier exists as a low-volume path for individuals with no EIN, and it comes with its own throughput caps and a single-number limit. Standard use cases assume a vetted registered entity behind them, so the platform refuses the combination rather than granting an individual standard-tier treatment.",
  "layer": "CROSS",
  "layerSlug": "cross",
  "object": "brand.entity_type + campaign.usecase",
  "severity": "BLOCKING",
  "detectability": [
    "DETERMINISTIC"
  ],
  "failureClass": "RETRY_FIELD",
  "authorities": [
    "TCR",
    "Twilio"
  ],
  "applicability": {
    "entityTypes": [
      "SOLE_PROPRIETOR"
    ]
  },
  "applicabilityText": "Applies when the brand is a sole proprietor.",
  "universal": false,
  "dependsOn": [
    "BRD-065"
  ],
  "remediation": "Select the Sole Proprietor use case for this campaign. If you need a standard use case such as Marketing, obtain an EIN and re-register the brand as a standard entity first — the tier, not the campaign, is what limits you.",
  "example": "Use case: SOLE_PROPRIETOR",
  "notes": "Catalog BRD-089. The most common failure after a sole proprietor brand is itself accepted.",
  "catalogIds": [
    "BRD-089"
  ],
  "phase": "approval",
  "automated": true,
  "url": "https://ekas.io/rules/10dlc/cross/xbc-001/",
  "markdown": "https://ekas.io/rules/10dlc/cross/xbc-001.md",
  "registry": "https://ekas.io/rules/10dlc/",
  "updated": "2026-07-25",
  "licence": "CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/"
}