Calendar appointment from other user, dies not show up in davx5 synched calendar

Dear all,
I have created a shared calendar in my managed nc.
The other user got the rights to edit the calendar.
Everything works pretty smoth:

  • i can create appointments everywhere and they going to show up everywhere (online, my and my wifes mobile - iphone and android)
  • she can create appointments which show up everywhere ! Except my mobile (davx5 syncronized webdav) calendar!
    if i duplicate with my user her appointment online, it is shown on my mobil!
    so i guess that has something to do with userrights.
    Can someone guide me to the right path?