title: Jasper Reports - How to create crosstab derived measure?
body: <p>I need to create a derived column in a jasperreport crosstab e.g. </p>
  
  <pre><code>Region   | Type 01 | Type 02 | Derived Measure
  zone 1   | Sum     | Sum     | Type 01 / Type 02 ( only in zone 1)
  zone 2   | Sum     | Sum     | Type 01 / Type 02 ( only in zone 2)
  </code></pre>
  
  <p>Any ideas?</p>