ObjectType.model.id

Project service version: 1.0.0-rc.3

PUT /object-types
{
  "id": "testOT",
  "name": "testOT",
  "source": "string"
}

leads to

{
  "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
  "title": "One or more validation errors occurred.",
  "status": 400,
  "traceId": "00-8bdc39dcf84c6f1a08dc26fd86a7558b-8d01596d437c7401-00",
  "errors": {
    "Model.Id": [
      "The Id field is required."
    ]
  }
}

but it should be fine (model is nullable). Moreover, it should probably return something like 500/ValidationError?