While registering a client to Red Hat Satellite 6 server via bootstrap script, it fails with "422 Unprocessable Entity" error.

Issue

• When attempting to register a system to Red Hat Satellite 6 using bootstrap script, getting 422 Unprocessable Entity messages with the following responses:

  [RUNNING], [2017-03-25 13:33:28], [Calling Foreman API to create a host entry associated with the group & org]
  An error occured: HTTP Error 422: Unprocessable Entity
  url: https://satellite.example.com:443/api/v2/hosts/
  code: 422
  data: {
    "host": {
      "managed": "true",
      "name": "client",
  "hostgroup_id": X,
  "organization_id": X,
  "mac": "00:50:56:B4:F5:2F",
  "architecture_id": 1,
  "location_id": X,
  "domain_id": X
  }
  }
  error: {
  "error": {
  "errors": {
    "operatingsystem_id": [
      "can't be blank"
    ]
      },
      "id": null,
      "full_messages": [
        "Operatingsystem can't be blank"
      ]
    }
  }