Can't edit event in CalDAV

[msphn]

Situation

Create event with external attendee, attendee acknoledges

Edit: This also happens to other events. Some are not editable using CalDAV but Tine 2.0 works fine.

Behaviour

Sync works, but can't editing in CalDAV. Still able to edit in Tine 2.0 directly

Expected behaviour

Being able to edit all events where I'm the organizer.

[msphn]

OK. It's probably not related to iMIP. It only happens in shared containers but I search for this problem in personal containers so I can't tell for sure.

Easiest example is, the organizor is able to edit but another persom with same permissions is not able to edit but for example able to delete. So I'm not sure if this issue is related to apple calendar or something doesn't work with Tine 2.0.