WebLogic Server 10.3 is the most recent version certified for use with OES is 10.1.4.3. If you want to run OES with WebLogic 11gR1 (also known as WebLogic 10.3.1) you will need to take a few extra steps.
1) install WebLogic 11gR1
3) install OES 10.1.4.3 Admin Server
2) unzip the latest CP
3) edit the ApplyAdminPatch.sh/.bat
4) apply the patch
5) run install_ales_schema.sh/.bat
Update on Dec 2, 2009: CP3 is now available.