title: restapi lookup column sharepoint
body: <p>I am trying to fetch an additional lookup column. From List A I have a field which is looked up in list B, and I have added an additional column from list A.  How to fetch from the additional column using the REST API?</p>
  
  <pre><code>/_api/web/lists/getbytitle('ListB')/items?$select=Title,ListA/ProjectName,ListA/OM&amp;$expand=ListA
  </code></pre>
  
  <p>I am getting "invialid column OM".</p>