This guide will assist you in enabling pro-rate of the allowance.

To pro-rate an allowance, go to Tools > General Maintenance > Allowance.

Click on the pencil icon to edit the allowance you would like to pro-rate.

Tick Prorate check box and click on Save.

Ensure that the allowance has been assigned to the employee, go to Payroll > Employee > Employee Maintenance  and maintain the employee's join date and select the allowance and maintain it's full amount.

Process the payroll and check if the amount is correct and pro-rated accordingly.