samba - Sep 2010 - Creating users difference between tbsam and smbpasswd backends

Hi,
I have installed Samba 3.5.4 on a Sparc Solaris 10 system and when I try to
create groups or users
on the PDC, I get different results using smbpasswd or tdbsam backend.

For an existing Unix user (or group), with smbpasswd backend, the RID is, as
before, set to
2*UID+algorithmic_rid_base.
For the same user, using tdbsam password backend, the RID is set to some value
like 1000, 1001,...

Is this correct or is there some hidden parameter incorrectly set in my smb.conf
?

[global]
         unix charset = iso8859-1
         workgroup = DCSD-T
         interfaces = bge0
         map to guest = Bad Password
         passdb backend = tdbsam:/var/samba-3.5.4/private/passdb.tdb
         username map = /usr/local/samba-%v/lib/usermap
         log file = /var/samba-%v/log/samba-%m.log
         printcap name = /usr/local/samba-3.5.4/lib/printcap
         disable spoolss = Yes
         logon path          logon drive = Q:
         logon home = \\%L\%U
         domain logons = Yes
         os level = 32
         preferred master = Yes
         domain master = Yes

[netlogon]
         comment = Network Logon Service
         path = /var/samba-%v/netlogon
         browseable = No

[profiles]
         comment = Profiles Service
         path = /var/samba-%v/profiles
         read only = No
         create mask = 0600
         directory mask = 0700

[print$]
         comment = Printer Driver Download Area
         path = /var/samba-%v/drivers
         write list = root
         guest ok = Yes

[printers]
         comment = All Printers
         path = /var/samba-%v/spool
         create mask = 0700
         guest ok = Yes
         printable = Yes
         browseable = No

[homes]
         comment = Home Directory
         read only = No
         create mask = 0640
         directory mask = 0750
         browseable = No

Thanks