Calendar Sync Error is not specific enough - which is the entry that is causing a problem?

I would like to know which item in my calendar is preventing the syncing. I get the error that I am not the owner - but which entry is that?

Please enable GData logging, wait until the error message appears and then send us the log. Or try to find the problematic event in the log yourself.
Logging settings can be found under Tools - Settings - Advanced.