[Dovecot] ldap quota limitation problem

[razor]

hi there

i have a such problem:

in dovecot.conf
...
protocol imap {
   listen = *:143
    ssl_listen = *:993
   mail_plugins = quota imap_quota
     }
...

quota = dirsize:storage=10240

...

in dovecot-ldap.conf:
...
user_attrs = uid,,,uid,uidNumber,gidNumber,boxQuota=quota=dirsize:storage
...


when an user try to answer out from overquoted box he got the message  
"overquota blahblahblah", BUT the message still goes...
it seems that the imap_quota worked (report about the overquota) but  
plugin quota dont work.

in dovecot logs :
...
Sep 14 09:10:23 xxxxxxxxxxx dovecot: IMAP(test4): dirsize quota limit =  
1000kB
...
but in user maildir/maildirsize:
0S,0C
1179466 16
1248 1

what it can be?
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