I would like to create a Actions Scheduled to update my value via the function: or sql command to do this

@ api.onchange ('x_effective_date', 'x_contract_duration')

     def _onchange_x_effective_date (self):

         if self.x_effective_date:

             start_datetime = datetime.strptime (self.x_effective_date, "% Y-% m-% d% H:% M:% S")

             if self.x_contract_duration! = 0:

                 self.x_contract_enddate = start_datetime + monthdelta (self.x_contract_duration) - timedelta (days = 1)

-------- I also created a new def to make a call in the Scheduled Actions, but failed,

@ api.model

     def set_contract_enddate (self):

         cho rec in self:

             rec._onchange_x_effective_date ()

"" ValueError: <class 'NameError'>: "name 'set_contract_enddate' is not defined" while Evaluating

'set_contract_enddate' ", please tell me, thanks