[Inf-IT DAVcl] Duplication with Recurrence

Hello, first as well many thanks for this nice piece of software. After applying the patch http://www.inf-it.com/fixes/interface.js.diff you gave in the thread "Creating a new event by duplication..." I can now duplicate singular events. However, if the original event is recurrent, the new event does not appear in other davclients. On my server (radicale), I see in the original event: RRULE:FREQ=YEARLY;BYMONTHDAY=XXXXXXX whereas in the copied event, there is now a : RECURRENCE-ID;VALUE=DATE:XXXXXX Also even on infcloud side, the new event has no recurrence that I could alter. Could you have a look into that? Many thanks, Christof