title: Can't query multiple subject areas in OBIEE
body: <p>everyone. I am using OBIEE 12c and I faced a problem when trying to use two different subject areas in generating an analysis.</p>
  
  <p>I started with creating the analysis based on one subject area. Then in Criteria tab, there is '>>' icon which contains 'Add/remove subject ares' link. Howerver, in my case it is not selectable. What can I do? </p>
  
  <p>If there should be done any joins in repository level, how to do that? Thanks for help</p>