samba - May 2004 - how can I make administrator Unix = Administrator XP

Hi guys

environment: samba 3.0.2
Debian Sarge

After reading samba 3 how to (Chapter 11. Group Mapping MS Windows and
UNIX )I made exacly the same process of adding a unix group into a XP
group but I received a different output.
What do I need . Transfor Administrator group in Unix as the same as XP.
Than I could change remote profiles correct, could 't I?

see below:
#) net groupmap add ntgroup="Domain Admins"
unixgroup="Administrador"
#) net groupmap list
System Operators (S-1-5-32-549) -> -1
Domain Users (S-1-5-21-3939155289-3141390475-2008170846-513) -> -1
Replicators (S-1-5-32-552) -> -1
Guests (S-1-5-32-546) -> -1
Power Users (S-1-5-32-547) -> -1
Print Operators (S-1-5-32-550) -> -1
Domain Guests (S-1-5-21-3939155289-3141390475-2008170846-514) -> -1
Administrators (S-1-5-32-544) -> -1
Domain Admins (S-1-5-21-3939155289-3141390475-2008170846-512) -> -1
Account Operators (S-1-5-32-548) -> -1
Backup Operators (S-1-5-32-551) -> -1
Users (S-1-5-32-545) -> -1
Domain Admins (S-1-5-21-3939155289-3141390475-2008170846-1001) ->
Administrador                                            ^^^^ 

How can I change this RID-1001 to RID-512??? Is there any other way??
Can anyone point me a right direction/howto/tutorial??

thanks in advanced