title: Cannot add new issue to Jira via REST API
body: <p>I am unable to create the custom field using Jira rest API, Code below:</p>
  
  <pre><code>curl -D- -u abc:1234 -X POST  https://*******.atlassian.net/rest/api/2/issue --data '
  {
      "fields": {
          "project": { 
              "key": "HELLOWORLD"
          },
          "summary": "Test-RestAPI",
          "description": "Creating Task using project keys and issue type names using the REST API",
          "issuetype": {
              "name": "Task"
          },
          "customfield_10200": { "name": "ABC" },
          "customfield_10300": { "name": "ABCD" }
      }
  }' -H "Content-Type: application/json"
  </code></pre>
  
  <p>Error Below: </p>
  
  <pre><code>{"errorMessages":[],"errors":{"customfield_10300":"Operation value must be a string"}}
  </code></pre>
  
  <p>Any Ideas?</p>