Installing samba

I've been trying to use apt-rpm to install samba3, but I get version 3.0.0rc4 installed all the time. Using apt-cache to search, I see that both versions are available both at gwdg.de and and uni-bielefeld. But for some reason, version 3.0.0rc4 is treated as a higher version than 3.0.0. Anyone know of a way to force the issue, with apt?