title: Provisioning profile use existing certificate doesn't work
body: <p>I want to use push notifications. </p>
  
  <p>What I have done so far:
  - Generated App ID
  - Enabled Push Notification for this App ID
  - Generated Development Certificate for Push Notification</p>
  
  <p>Now I want to generate a provisioning profil.
  I can see my generated Certificate in the member center, but I can't use it to generate a promising profile. It always wants me to generate a new certificate. I can't select an existing one...</p>
  
  <p>Do you know why?</p>