I need to Disable Pos Refund button based on employee field named disable_refund_button
I added this code but it does not work

from odoo import fields, models, api


class HrEmployee(models.Model):
    _inherit = 'hr.employee'

 

    disable_refund_button = fields.Boolean(default=False,
        string="POS-Disable Refund Button",
        help="Disable the Refund button on the POS")
class PosSession(models.Model):
    """
    The inherited class PosSession to add new fields and models to pos.session
    """
    _inherit = 'pos.session'

    def _loader_params_hr_employee(self):
        """
        Method for loading hr_employee fields to pos.session
        :return: dictionary containing hr_employee access right fields
        """
        result = super()._loader_params_hr_employee()
        result['search_params']['fields'].extend(
            ['disable_refund_button'])
        return result