title: How to count selected values of a prompt value parameter in cognos
body: <p>I have a prompt page and a page with a list.
  The user selects the values from the prompt page and the report page is then generated. A usual report.</p>
  
  <p>The prompt page has a multi select list box with 20 values.</p>
  
  <p>What i want to do is:
  When the user selects up to 3 values from the list box then in the report header show the values with ParamDisplayValue('param1'), if the user select more than 3 show ") items selected" eg: "5 items selected"</p>