title: 'PrimitiveValue' node with non-null value was found when trying to read the value of a navigation property;
body: <p>How can I save document library lookup field using REST API Post in a SharePoint list?
  I tried like </p>
  
  <pre><code>'docItem':'1;#test'
  </code></pre>
  
  <p>But, it is throwing an error :</p>
  
  <blockquote>
    <pre class="lang-json prettyprint-override"><code>{
    "error": {
      "code": "-1,Microsoft.SharePoint.Client.InvalidClientQueryException",
      "message": {
        "lang": "en-US",
        "value": "A 'PrimitiveValue' node with non - null value was found when trying to read the value of a navigation property;however, a 'StartArray' node, a 'StartObject' node, or a 'PrimitiveValue' node with null value was expected."
      }
    }
  }
  </code></pre>
    
    <p>Bad Request</p>
  </blockquote>