title: SSR Sorting Expression using Report!Items
body: <p>I have a report using Matrix table group by Business with Sub-total and grand total.  I have a calculated field called "% of Received" column that uses Report!Items in the detail row, and I want to sort it from highest to lowest value <code>=ReportItems!MTDPACount.Value/ReportItems!MTDLOBTotal.Value</code>, but it is giving me an error that Report Items cannot be used in expression. Please advise.
  Thanks</p>