Belgian payroll now calculates the part-time percentage correctly by comparing the employee's part-time schedule with the reference schedule. Users must also enter the required part-time work entry time when marking a contract as part-time, helping prevent payroll mistakes.

When part time is checked, make sure to compute the part time % field
correctly using the part time calendar and the reference calendar.

Also force the user to set a part time work entry time when part time is
checked.

Task ID: 2499942