i created a salary rule called Unpaid leave and it depends on a python code like this:

result= worked_days.Unpaid and worked_days.Unpaid.number_of_days*(contract.wage/31) or 0

and the employee took 2 days unpaid leaves

i added the rule to the salay structure of the employee

then in the payslips i compute sheet and show the salary computation tab but the Unpaid leave show as zero inspite of the 2 days leave of that emplayee

is the unpaid number of days is zero? and if not zero why it is not computed in the employee payslip?