cms_user custom field macros

Hi guys I have a problem with macros in where part of a query repeater web parts. I have a custom filed in CMS_User system table called @BusinessUnitId @ I want to make a where condition by comparing CurrentUser.BusinessUnitId and a field of another table which I called it @ReagentGUID@ of @c@ table the macro that i have used is {%CurrentUser.BusinessUnitId#%} = c.ReagentGUID but it see the following error:Server Error in '/' Application. An expression of non-boolean type specified in a context where a condition is expected, near 'c43'.