[kronolith] Remote calendar event (ical webdav) - cannot save as new

[gui]

Hi Everybody

When saving an event in a remote ical webdav calendar, I got this error:
"There was an error accessing the calendar: No object requested.".

That is, I went to edit an event in a remote calendar (ical on Webdav),
clicked on "Save As New" and got the error.

My configuration:
I'm using Horde 3.05, Kronolith H3 (2.2CVS - latest, just CVS today),
Imp H3 (4.0.3)
with mysql-server-4.1.14, php4-4.4.0, apache-2.0.54_3 running Freebsd 5.4.

Is it possible to edit and save as new events in a remote ical webdav
calendar?
Or are they read-only? If they are read-only, there should not be an
Edit icon next to the event, right?

Thank you very much in anticipation.

Regards

Gui
California