Custom CD for SLES9 x86_64

Hello everybody, I try to create a custom CD for SLES9 x86_64. With Yast CD Creator I setup the hierarchy needed to install Linux. Then I put Enterprise Agents into a separate directory. These get installed by the postinstall script. Then I compiled everything with mkisofs. I can boot from the CD, there's a popup complaining that I try to install 32bit software on a 64bit hardware. In the Yast log file I can see that yast is doing some magic to avoid this messages. Is somebody willing to share this magic with me ? Sincerely Bernhard