title: How can I write expression to take an subtraction of two fields in ssrs?
body: <p>I'm working on SSRS report.</p>
  
  <p>There are two main fields <code>CurrentMV</code> and <code>PreviousMV</code>.</p>
  
  <p>field <code>CurrentMV</code> having expression <code>=Sum(Fields!CurrentMV.Value)</code></p>
  
  <p>field <code>PreviousMV</code> having expression <code>=Previous(Sum(Fields!CurrentMV.Value))</code></p>
  
  <p>I'm having another field on report <code>MTM</code> which is nothing but difference between </p>
  
  <p><code>CurrentMV- PreviousMV</code> How can I write expression for <code>MTM</code> as there is already expression used in <code>CurrentMV</code> and <code>PreviousMV</code> </p>
  
  <p>please help me.</p>