[Dovecot] 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