Caldav Recursive events error

[joan-open]

Hi, I've realised that in any of our Caldav Clients it's impossible to modify a ocurrence of a recursive event that i've generated from the Client(thunderbird for example).
On the other hand, if i generate the recursive event on the web interface, then i can modify any single ocurrence on the Caldav Client without errors.
Looks like its a permissions problem.
Anyone has meet this error before?, there are any solutions?