CalDAV Synchronisation only in one direction

Hello,

I have the problem, that the CalDAV Account sync only in one direction, eM Client --> Server --> Smartphone.
When I create a date in eM Client it syncs over the Server to my Smartphone.
The other direction doesn’t work, Smartphone --> Server -/-> eM Client.

According to the protocol one file was downloaded, but it is not displayed in the calendar.

I use the new Version 7.1.

and the caldav server  name ?

The Webhoster www.one.com. With Outlook and Blue Mail works fine.

So, the Synch-Protocol:

http://www.directupload.net/file/d/4749/cbrl3h6a_png

Problem: The @ symbol ist changed in %40  and so it comes to an BadRequest.
But one file is downloaded but can not displeyed in the Calendar.

I am also having my calendar at one.com and experience the same problem. Is there a solution to it?
Kind regards
Robin

Ahhh. I found out. I just had to remove the CalDAV account in eM Client and recreate it where I replace @ with %40 in the CalDAV URL.
Robin