[Inf-IT DAVcl] CalDAVZap with CalendarServer

Hello to everyone, I’m trying the CalDAVZap module with a CalendarServer installation (it’s version 4.2 but I made the modifications from the diff file manually). It works perfectly with it, I can see my calendars/events. But the default Apple Calendar/iCal application cannot list the person’s permitted delegations after that. It just says « Delegation is not supported by this server », when usually it lists the calendars I have read and/or write access to… When I remove the diffs from CalDAVZap, that functionality comes back, but I cannot use CalDAVZap :( Anybody can help with that? Thanks in advance Pascal