I have a very simple report that defines a shipdate as a datetime value so I can use the calendar functionality in SSRS2005. The user can choose the date, which then gets passed to a hidden parameter which has a sql back end that returns an mdx value to be used by the cube. When I uncheck the 'hide' button on the second parameter, the report runs fine. When I hide this parameter I get the error the "xxxx" parameter is missing a value.