title: Lookback API: _ItemHierarchy Scoping - Ignore Forbidden Projects
body: <p>I have been trying to query for User Stories which descend from the RPM by using the Lookback API in conjunction with the _ItemHierarchy filter. The problem seems to be that the Lookback API wants to return data from all the projects it knows about, but apparently that includes projects which I don't have permission to access. I get the following error when trying to run the query:</p>
  
  <pre><code>"Errors":["Server Error: Your request requires access to a workspace or project for which you do not have permission.  Contact your subscription administrator to request permission."]
  </code></pre>
  
  <p>I would like it if there was a way to ignore all projects which I don't have access to and just return me the User Stories which my permissions allow me to see. (And possibly alert me to the fact that not all were accessible)</p>
  
  <p>At the very least, I would like a way to catch the TypeError that the API throws when the error is encountered. I tried using try/catch blocks but that doesn't seem to be effective in this context.</p>