title: BIRT: Using information from one Dataset as parameter of an other
body: <p>i'm creating some BIRT-Reports with Eclipse. Now i got the following problem.
  I've got two datasets (Set one named diag, set two named risk). In my report i produce fpr every data in diag a region with an diag_id. Now i tried to use this diag_id as input parameter for the second dataset (risk). Is this possible, and how is this possible?</p>