if(courseOffering && timetableToDelete) {
        try {
         	courseOffering.removeFromTimetables( timetableToDelete )
          timetableToDelete.delete(flush:true)
          flash.message = "Timetable record has been deleted"
        }
        catch(org.springframework.dao.DataIntegrityViolationException e) {
          flash.message = "Timetable record ${params.id} could not be deleted"
        }
      }