title: SSRS - Expression using different dataset fields without the "first" or "sum"
body: <p>I have a ssrs report with three datasets. I would like to populate a column that shows =(Fields!Total_Hrs.Value, "Dataset3") without the "SUM(Total_Hrs)" that is showing as an option when I click on Datasets under the Category.</p>
  
  <p>The problem with using =(Fields!Total_Hrs.Value, "Dataset3") is that I'm getting an error stating "Report item expressions can only refer to fields within the current dataset scope or, if inside an aggregate, the specified dataset scope."</p>
  
  <p>Would one know what is causing the error? Is there a way to have the expression window show my Fields as DataSet3?</p>
  
  <p>Thank you.</p>