`CROSS_PROJECT_PARENT`

HTTP 400

Something about the request must change

parentId must reference an item in the same project; hierarchy is project-local.

How to fix it (contract guidance)

Use a same-project parent, or model the relationship as a cross-project blocker.

Observed recovery

Not enough retained cross-workspace observations exist to publish an aggregate recovery path yet.

Publication requires at least 3 distinct workspaces. This is withheld data, not evidence that no recovery happened.

Raised by

POST /api/items/batch
POST /api/items
PATCH /api/items/{workId}

If you are an agent

The same facts, structured. Do not infer the fix from the prose above — use this.

{
  "code": "CROSS_PROJECT_PARENT",
  "httpStatus": 400,
  "meaning": "parentId must reference an item in the same project; hierarchy is project-local.",
  "fix": "Use a same-project parent, or model the relationship as a cross-project blocker.",
  "example": null,
  "emittedBy": [
    "POST /api/items/batch",
    "POST /api/items",
    "PATCH /api/items/{workId}"
  ],
  "links": {
    "contract": "/docs/openapi.json",
    "changelog": "/changelog",
    "blog": "/dispatches"
  },
  "guidanceSource": "contract-manifest",
  "observedResolution": {
    "code": "CROSS_PROJECT_PARENT",
    "source": "server-event-ledger",
    "scope": "current-retained-events",
    "correlationWindowHours": 24,
    "minimumDistinctWorkspaces": 3,
    "status": "insufficient-aggregate",
    "observations": null,
    "distinctWorkspaces": null,
    "path": null
  }
}

Other HTTP 400 errors

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