Pay Period Salary computation (as 1/13 of Annual Salary)

Hello,

How can I have the Pay Period Salary in the Basic Compensation form of the employee to be computed as 1/13 of the Annual Salary instead of 1/12?

I changed the ‘M’ (Monthly) code in the 06/PQ UDC from 012 to 013. So, when I enter the monthly salary e.g. 1000 the system multiplies it by 13 (e.g. 13000), but the Pay Period Salary is computed as 1/12 of the annual salary (the system displays 1,083.33).

Is there any other setup that has to be done?

Thank you