[Samba] username map behaviour with security=user

[Vladimir Yumashev]

I use Samba 2.2.0 on small network.  I use "security = user" and "username map" to map 
some Win-users to unix users.
I have simple testing file with username mapping:

    vlad = vova vladimir vovan

According to manpage if I connect to Samba as "vova" I should supply vova's password.  Then Samba maps me to unix user "vlad".  Then I have vlad's rights to files in share.  Right?  Yes.  It works this way when "security = domain" and Samba is domain member.

But when "security = user" Samba behaves differently.  When I connect to share as "vova" Samba rejects vova's password.  Logfile tells me that Samba tries to find user "vlad" in password database and checks my password against vlad's password.  
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[2003/02/06 07:54:21, 1] smbd/password.c:pass_check_smb(545)
  Couldn't find user 'vlad' in passdb.
[2003/02/06 07:54:21, 1] smbd/password.c:pass_check_smb(545)
  Couldn't find user 'vlad' in passdb.
[2003/02/06 07:54:21, 1] smbd/reply.c:reply_sesssetup_and_X(1001)
  Rejecting user 'vlad': authentication failed
---
It looks like Samba first maps user and then check him in passdb.  
How to handle this?  I need realy working username mapping.

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Regards,
Vladimir