On some day you apply to go to a doctor from 12:00 to 16:00, which will be approved. Then you go to the doctor at 12:15 or maybe at 11:50. In this case, there could be collisions in attendance between an approved request and actual chipped attendance. It does not matter now.
In the “User - Attendance - Attendance activities” menu, you can turn on the “Real time preference before request” option for selected activities (such as “Physician”) in the “3 Others” tab. If enabled and within one day, both the approved application and actual user-chipped attendance are included in the activity (physician), then the actual user-chips are always used for the calculations.