title: How to get fields from Running total to minus in formula field in Crystal Report
body: <p>I created two fields in Running Total fields (SUMEXSPENCE&amp;SUMRECOVER)
  <a href="https://i.stack.imgur.com/Z2AxT.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Z2AxT.png" alt="enter image description here"></a></p>
  
  <p>and then I want to take these two field to minus in Formula Fields (MinusExpenseRecovery).</p>
  
  <p><a href="https://i.stack.imgur.com/vFmGo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vFmGo.png" alt="enter image description here"></a></p>
  
  <p>So how can I do that? And one more question, sometimes when loop data sumrecovery is null. So how can I set condition in formula?</p>
  
  <p>Thanks in advance</p>