I did a search on Business Object's KB area for ASP.NET and login failed...I found 3 hits. In reading these, I'm not sure they'd apply, and since your code example had a table name, I really doubt #3 would apply, but here they are.
When you created the RPT file and layed out the columns, your 'design time' data source was an XML/XSD file (as opposed to something from SQL), correct?