samba - Dec 2003 - Samba 3 PDC with LDAP - Error when changing user password from windows

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Hi all!
I've a Samba 3 PDC with LDAP backend.
When I join domain from a WinXP machine, the machine account is added in LDAP, 
it works fine.
I can log on this machine with a user I created before with smbldap-useradd.pl 
script.
When I want to change his password from windows (CTRL-ALT-SUP panel), it 
says: "don't have the right permission to do that..." but password
is changed
in LDAP with the new one.
And when I log back this user, I need the new password.
I'm using smbldap-passwd.pl to change password.
In Samba log, i see NT_STATUS_ACCESS_DENIED and NT_STATUS_WRONG_PASSWORD

thanks for help