title: Bad int8 external representation
body: <p>In my report, I created a data item using a case statement that puts order revenue amounts into groups like $0-$999, $1000-$1500, etc.  I am trying to create a drilldown off of that data item but I am getting the below error message:</p>
  
  <blockquote>
    <p>Data source adapter error: org.netezza.error.NzSQLException: ERROR: Bad int8 external representation "$0-$999"</p>
  </blockquote>
  
  <p>Any help would be appreciated.</p>