iCal picks wrong calendar for invites - how do I change that?

When ever I am recieving a meeting invitation by mail it goes into the wrong calendar. I have several personal calendars in iCal, some subscriptions and we have a common shared meeting calendar for the company.

My personal invites through mail always goes into our common meeting calendar. I have found no settings to change that. Once the invitation is in iCal, I can't change calendar, they are all dimmed, nor can I answer the invitation. Nor does these invitations sync to my iPhone, iPad or Mobile Me.

Has anyone experienced this problem and found a sollution?