6) On the system installed with this DVD remove wrong installation sources
and set them to match the DVD.
rm -rf /var/adm/YaST/InstSrcManager/IS_CACHE_0x*
installation_sources -e -a cd:///SUSE-SLES-9-Service-Pack-Version-3/CD1/
installation_sources -e -a cd:///SUSE-SLES-Version-9/CD1/
installation_sources -e -a cd:///SUSE-CORE-Version-9/CD1/