title: SSRS 2008 - Error: Subreport could not be shown
body: <p>I have used SQL Server Business Intelligence Studio to create a Reporting Services 2008 project. Everything was moving right along until I tried to create a subreport, which led me to the familiar error:</p>
  
  <blockquote>
    <p>Error: Subreport could not be shown</p>
  </blockquote>
  
  <p>Yep, the main report and subreport work if run seperately. When I add the subreport to the main report, the main report runs fine and the subreport returns the error.</p>
  
  <p>Both reports are run from seperate stored procedures. The data source which drives both reports contains both procedures.</p>
  
  <p>The subreport has a single parameter. I have tried testing a static value, so I've added the parameter (right click on the subreport, select Properties, chose the Parameters tab, and added the correct parameter name with a value of =(16102)).</p>
  
  <p>If I add a subreport that has no parameters to the main report - the subreport just prints a string, for testing purposes - then that subreport displays correctly.</p>
  
  <p>Any words of wisdom?</p>