Hello

I need to make a call to a function in the payslip object, named, for example, salaryfunction:

class HrNicPaySlip(models.Model):
    _inherit = 'hr.payslip'

    @api.multi
    def salaryfunction(self):
       return 100.00

I need to call this function from the salary of type python code calculation rule, like this:

result = payslip.salaryfunction()

But I get the next error when calculate the pay sheep:

Wrong python code defined for salary rule

In the log the error is:

ValueError: : "'float' object is not callable" while evaluating u'result = payslip.salaryfunction()'

Could you please help with that? the version of the odoo is 10 and 11

I searched about some similar issue but without success

Thank you