title: Set OptionSetValue to null in Dynamics CRM Plugin
body: <p>I´ve already found a similar question but the answer just did'nt work for me so I wondered if there might be lilke any newer information on this topic.</p>
  
  <p>What I want to do is assign null to an OptionSetValue.
  What I've tried so far:</p>
  
  <ul>
  <li><p>someEntity.Attributes["myfield"] = 899270000; //Works </p></li>
  <li><p>someEntity.Attributes["myfield"] = null; //Not working</p></li>
  <li>someEntity.Attributes["myfield"] = 0; //Not working</li>
  <li>someEntity.Attributes["myfield"] = -1; //Also not working</li>
  </ul>
  
  <p>Thanks in advance.</p>