title: Apple Enterprise Developer Distribution Certificate appears in keychain, not in Xcode Organizer
body: <p>I'm a contract developer, and have an app to be distributed via the client's Enterprise account. 
  I've worked with other clients on Enterprise accounts, but for some reason, the "iPhone Distribution" certificate that I've added to my keychain for this client does not appear in Xcode Organizer. </p>
  
  <p>When I import a mobileprovision for the app, Xcode complains there's no valid key pair.</p>
  
  <p>The client has added me to their account; can only the developer who created the Enterprise Distribution certificate import it to a keychain? If I create a new distribution cert (not profile), does that invalidate the existing cert (used by other apps I have not worked on?)</p>