I posted the problem to EGroupware as well, but did not get an answer there.
I finally chose to swith to another CalDAV-Sync app which seems to work better with EGroupware.
I am using davdroid 0.4. with Baikal 2.7.3 . I have multiple calenders in Baikal an can import them all. Unfortunately they all have the same color and I can not adjust this at my Baikal server. Is there any way to change this for each calendar in the app?
Thanks in advance!
Please see #136.