Using Oracle OLAP With Oracle BI Enterprise Edition 10g Release 3 Sept 3rd 2008
After oracle acquired SIEBEL, Oracle renamed the Siebel BI products and called them Oracle BI EE
the following is a good link that helps you to learn the product.
One of the drawbacks of the Original Siebel package is it inability to deal with Oracle MOLAP engine.
The solution to work with ROLAP. However, is Oracle BI EE you can directly work with ROLAP
This is a sample of what is called Oracle Answers