BA Analysis report using more than one fact

Hi, I've created a star schema with two fact tables (which are joined by a key). Creating a new Data Source on BA for the star schema it asks me to state the fact table. I use one of the fact tables and create my joins. I then click the back button to go back and add my second fact. I create joins then using tis second fact including join to the first fact table. Once click finish it hangs.

Is it possible to have more than on fact table joined in the Data Source. If so how can it done?

Thanks