[Dovecot] IMAP copy fails because the mailbox size of user1 is exceeding the quota limit of user2??

See my message "quota using wrong limits in user shared mailboxes" from 13 Mar 2014 10:59:23.

Thank's for your answer Steffen. So I can confirm that I've the same problem as you. Could you find a solution to that? I still hope that this is a simple configuration problem, as I can't imagine, that we've been the first to experience that strange behavior that for me, is part of the core functionality of dovecot.