title: BusinessObjects 4.0 - Incompatible combination of tables
body: <p>In my BO universe there I intentionally left out contexts.
  Now when I select measures from multiple fact tables I get following error msg: </p>
  
  <blockquote>
    <p>Incompatible combination of tables </p>
  </blockquote>
  
  <p>Show details gives:</p>
  
  <blockquote>
    <p>Error:
    com.businessobjects.semanticlayer.qt.QTException: The query cannot run because it contains incompatible objects.  (WIS 00008)
    Cause of Error
    The query cannot run because it contains incompatible objects.  (WIS 00008)
    Cause of Error
    Incompatible combination of tables </p>
  </blockquote>
  
  <p>(btw - in the universe I have checked out the option "multiple SQL statements for each measure", which WAS checked by default)</p>
  
  <p>Does anybody now how to resolve this error?</p>
  
  <p>Second point - since I have intentionally removed contexts, that means there should be no loops in the data foundation. Right?
  That also means that I should use Alias tables to remove every loop. Can somebody confirm this assumption? </p>
  
  <p>And the last point is - I have 2 fact tables, and when I take both of them in the query panel, then I get one query -> one result. However I have additionally 2 fact tables, and when I take either one of them or both of them, I get 2 or 3 queries. Why is that happening, and where can I turn off generation of multiple queries? Thx!</p>