title: How to do SQL Server Reporting Services Matrix?
body: <p>I am using SQL Server 2008 and now I am stuck with a problem for past two days. I want to merge a particular group of cells in a SSRS Report.</p>
  
  <p>I have used the below code in the Background Color property of the text box</p>
  
  <p>=IIF((Previous(Fields!score.Value)=Fields!score.Value), "", Fields!score.Value)</p>
  
  <p>I get a an error saying
  "Error  [rsInvalidPreviousAggregateInTablixCell] The use of a Previous aggregate function in a TablixCell within Tablix ‘matrix1’ is not supported"</p>
  
  <p>Can any one help me with the error.</p>