title: SQL Server Reporting Services Default Values From Query not working in deployed report
body: <p>In order to populate a textbox in a page header I am setting up a parameter (as you cannot use Fields) and referencing this in the textbox. The parameter has the Default Value set to "From Query" and the Dataset and Value Field are set accordingly. This works a treat in developmentt in Visual Studio 2005. Once I have deployed the report and am viewing the report in the ReportViewer control I get the error:</p>
  
  <p>"Parameter validation failed. It is not possible to provide valid values for all parameters. (rsParameterError)".</p>
  
  <p>If I remove the parameter, the report works fine.</p>
  
  <p>(Strange thing is that I thought I had this working earlier).</p>