title: RDLC- use more the one dataset within the same table
body: <p>In my  wpf application i have rdlc reports.</p>
  
  <p>In one of the reports i have a table <code>Countries</code> with <code>idntCountry</code> in one <code>DataSet</code> -and the <code>countryName</code> is in a different <code>DataSet</code><br>
  So my question is:
  how do i build a table that would take values from more then one <code>DataSets</code>? i tried using the <code>Lookup</code> function but i keep on getting a the error: </p>
  
  <blockquote>
    <p>Report item expressions can only refer to fields within the current dataset scope or, if inside an aggregate, the specified dataset scope</p>
  </blockquote>
  
  <p>Technically, everything i try doing gives me that error.</p>
  
  <p>What am i doing wrong?</p>