Crystal Report with multiple datasources
<p>I am working on a <code>crystal report</code> like in the <a href="http://i.stack.imgur.com/OOxdJ.png" rel="nofollow">sample image</a>. it has some limited attributes and some attributes that will be repeated. like <code>item id will be repeated</code> for each item and <code>invoice id will be only one</code> in the whole invoice. I am trying to use two different tables one for repeating elements and one for single time elements. </p>

<p>I am facing problem in setting the <code>datasource of the crystal report</code>. how can I set it so that it may fetch data for <code>repeated elements from datatable one</code> and <code>other from datatable two</code>. 
Or if you know any other approach for such problem please share.  </p>