Storing secondary gid's in openldap

Hello, Do know of any manual/howto/doc about how to configure linux gid's thru openldap? This is, my openldap tree assigns different groups to my linux user, then i run:

$ id

uid=1000(mauro) gid=1000(mauro) groups=4(adm),20(dialout),24(cdrom),44(video),46(plugdev),104(lpadmin),115(admin),120(sambashare),1000(mauro)

and i get all the groups I'm part of. But, I repeat the operation:

$ id

uid=1000(mauro) gid=1000(mauro)

and I just lost all the secondary groups. All this with SLES9+openldap 2.2.3-43.

Thanks in advance, Mauro