title: SSRS 2005 Divide values of two text boxes
body: <p>I thought this would be simple, but i must be missing something</p>
  
  <p>here is my expression</p>
  
  <p><code>=Sum(ReportItems!ID.Value)/Sum(ReportItems!NumberofUnits.Value)</code></p>
  
  <p>I get this error.</p>
  
  <p><code>The Value expression for the textbox 'textbox14' uses an aggregate function on a report item.  Aggregate functions can be used only on report items contained in page headers and footers.</code></p>
  
  <p>I really just want to divide those two report item values.</p>