I have module `A` that has in One2many with this two Many2one

    partner_user = fields.Many2one('res.partner', string='Hesaby Customer')
    subscription_manager_id = fields.Many2one('n_hesaby_subscription_manager.subscription_manager', string='Subscription Manager ID')
 

in module `B` i what to know if module A has recored that has partner_user equate to created_by then reduced the recored `A` id

    created_by = fields.Many2one('res.users', string='Created By', default=lambda self: self.env.uid, readonly=True)
 

an not sure how to start solving this problem it can you please help I have been trying to find a way for two days now