To edit how class absences factor into the absence count, modify the Business Rule. 

To edit the display type on the report card parameter: 
  1. Open the report card parameter. 
  2. Select Details and open the Attendance column. Note: If you report on attendance in the Summary/Notes tab, select the Attendance section there and proceed to step 3.
  3. Select Columns and open the column with Sum of units as the Description. 
  4. Change the Field to show from Sum of units to Number of occurrences. 
  5. Click OK twice. 
  6. Preview and Print the Report.