curl --request GET \
  --url https://api.example.com/api/v1/kg/boards/{board_id}/supersedence/{decision_id}

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>",
      "ctx": {},
      "input": "<unknown>"
    }
  ]
}