dovecot - Jun 2012 - sieve and namespace

HI
I'm tryin to set up sieve the way so it will put incoming message into 
Junk folder, which is described via namespace.
Unfortunately rule doesn't work and message is put into Inbox. If i 
change destination folder to folder not described via namespace in the 
same rule the message is placed to that folder.
please help

dovecot 1.2.9

namespace:
   type: private
   prefix: Junk/
   location: maildir:/opt/mail/Junk/INBOX:LAYOUT=fs
   hidden: yes
   list: yes
   subscriptions: yes