title: BIRT Report - group tables with different data
body: <p>I am new to BIRT and I can't really figure out how Data Binding works. I need your help :)</p>
  
  <p>I have two tables that need to be linked (Element(s) with Sub Element(s)) and create groups of tables depending on how many elements and Sub Elements I have.</p>
  
  <p>There is an ID on each table to join them(BOBJECT_ID in Elements is equals with BOBJECT_ID in Sub Elements).</p>
  
  <p><strong>Scenarios:</strong></p>
  
  <ul>
  <li>I can have 1 Element with 0 or N Sub Elements</li>
  <li>I can have N Elements with 0 or N Sub Elements each</li>
  </ul>
  
  <p>To give more infos, here is an example:</p>
  
  <p><a href="https://i.stack.imgur.com/oU5kL.png" rel="nofollow noreferrer">1 Element with 11 Sub Elements</a></p>
  
  <p>This is an example in case there is only one Element - The Element 1 is represented in the first table and the second table represents the Sub Elements of the Element 1.</p>
  
  <p>In case there is another Element with Sub Elements, I need to create another 2 tables exactly like this one with the corresponding data. </p>
  
  <p>If I have 10 Elements each one with 5 Sub Elements, I have to create 10 groups of the 2 tables with each Element and his 5 Sub Elements.</p>
  
  <p>Thank you!</p>