title: Dynamics CRM 2013: Distribute CampaignActivity with custom channel
body: <p>Sorry in advance for my bad english :p</p>
  
  <p>I'm trying to distribute Campaign Activity using a new channel that I called "SMS",</p>
  
  <ol>
  <li>I added the SMS option in the channeltypecode picklist, </li>
  <li>and updated the boutton (on rubbon) of distrubution action, and make it call a
  new javascript function (ActionToDistributeSMS) if channel is SMS,</li>
  <li>and I developped a plugin (C#) to destribute the CampaignActivity</li>
  <li>the ActionToDistributeSMS() function will lance the plugin</li>
  </ol>
  
  <p><em>...
  (DistributeCampaignActivityResponse)service.Execute(distrubuteCampaign); //code from the plugin
  ...</em></p>
  
  <p>my problem is that I recieve this error: "An invalid object type was specified for distributing activities"
  Detailled error: "Only activities appointments, emails, faxes, letters and phone calls are supported."</p>
  
  <p><strong>how can I add SMS to supported channel types ?</strong></p>