[Samba] samba as PDC; nt4 as BDC

[NSC - NetworkServiceCenter]

hi all,

i know it sounds really silly, but i tried to join a nt4 as a BDC (!) to my
samba domain. it doesn't work, because nt tells me, that the computername
is already in use for a server or a ws, but there is only the account i
created for the bdc. if i delete the account nt tells something about
computeraccount doesn't exist - of course, there is none ;-)
has anyone a idea what to do or doesn't it work?

reason: i want to migrate from nt4 to samba-ldap-pdc, but the first 6 month
i also want to have the old system as backup system. the problem is, if
really a crash occours, our team has to join near to 200 ws to the new
domain.

thanks in advance
lg
thomas reisenbichler