curl --request PUT \
  --url https://cloud.memsource.com/web/api2/v1/projects/{projectUid}/jobs/{jobPartUid}/customFields/{instanceUid} \
  --header 'Content-Type: application/json' \
  --data '{
  "selectedOptions": [
    {
      "uid": "<string>"
    }
  ],
  "value": "<string>"
}'

{
  "uid": "<string>",
  "customField": {
    "uid": "<string>",
    "name": "<string>",
    "type": "MULTI_SELECT",
    "allowedEntities": [
      "PROJECT"
    ],
    "options": {
      "truncatedOptions": [
        {
          "uid": "<string>",
          "value": "<string>",
          "deprecated": true,
          "used": true
        }
      ],
      "remainingCount": 123
    },
    "createdAt": "2023-11-07T05:31:56Z",
    "createdBy": {
      "firstName": "<string>",
      "lastName": "<string>",
      "userName": "<string>",
      "email": "<string>",
      "role": "SYS_ADMIN",
      "id": "<string>",
      "uid": "<string>"
    },
    "lastModified": "2023-11-07T05:31:56Z",
    "lastModifiedBy": {
      "firstName": "<string>",
      "lastName": "<string>",
      "userName": "<string>",
      "email": "<string>",
      "role": "SYS_ADMIN",
      "id": "<string>",
      "uid": "<string>"
    },
    "requiredFrom": "2023-11-07T05:31:56Z",
    "required": true,
    "description": "<string>"
  },
  "selectedOptions": [
    {
      "uid": "<string>",
      "value": "<string>",
      "deprecated": true,
      "used": true
    }
  ],
  "value": "<string>",
  "createdAt": "2023-11-07T05:31:56Z",
  "createdBy": {
    "uid": "<string>"
  },
  "updatedAt": "2023-11-07T05:31:56Z",
  "updatedBy": {
    "uid": "<string>"
  }
}