Hi,
Samba 2.2.2 (which is underlying SME 5.0 and should be with e-smith 4.1.2 after an Upgrade) does not support NT/w2k Servers as a BDC.
If there is a MS-Server in your LAN, it must (and should-) work as a PDC, because everything else would cause endless errors.
As far as i know (this question occured more often) MS-Servers can only work as a BDC (BackupDomainController), if there is another MS-Server in the Lan. And that is what you are trying to do.
Also there is an unsolved phaenomenon in my Lan, that Samba even fails some Access Operations on Samba, if there is any other MS-Server active in the lan (must be something around NETBIOS/´Browsing, i was not able to solve yet).
So you should better not waste any more time on that thing...
hth
Alex