Hi,In a scheduled action, the self variable, which typically represents the record(s) being processed, will indeed be undefined or empty because scheduled actions are not triggered by a specific record. Therefore, you cannot directly call a function on self in a scheduled action.

To call a function in a scheduled action, you can search for the required records using a suitable model, such as mail.activity.schedule, and then perform the desired operation. Here's how you can do it:

example:

Please try with the below code

if records(self):

    action = self.env['mail.activity.schedule'].self.env['mail.activity.schedule'].search([], limit=1)

        if action:

            record_to_process = action[0]

             record_to_process.action_schedule_activities()

Hope it helps