Report with data link not working with Silverlight viewer *

hi, I got an issue with the Report using the data link to display non-spatial data. the report works when the data is from the layer directly, but it fails when it tries to grab the data from the external database. but the datalink works fine and it can be viewed from the tab. I am using geocortex 4.0 and silverlightviewer  2.1 with oracle database. so I pick oracle OLEDB connection. does anyone has the same problem? Thanks a lot.