why can`t i attach wrr to a htb or hfsc class ?

"Salatiel Filho" <[email protected]>
Newsgroups gmane.linux.network.routing
Message-ID <[email protected]> 
Attaching WRR to a hfsc ot htb class after a while i will get all
packets drop and syslog full of
HFSC or HTB : Non-work-conserving qdisc

any ideas ?
-- 
[]'s
Salatiel

"O maior prazer do inteligente é bancar o  idiota
   diante de um  idiota que banca o inteligente".
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