All employment data is missing

When I request an employment for a person All I get is this:

{
  "id": "xxx",
  "person": {
    "id": "xxx"
  },
  "status": "ACTIVE",
  "_meta": {
    "links": {
      "person": {
        "href": "https://api.personio.de/v2/persons/xxx"
      },
      "supervisor": {
        "href": "https://api.personio.de/v2/persons/xxx"
      }
    }
  }
}

Where is all of the other data?