class Move(metaclass=PoolMeta):
    __name__ = 'stock.move'

    shipping_mode = fields.Many2One('shipping.mode', "Shipping Mode",
        states={
            'readonly': Eval('state').in_(['cancel', 'assigned', 'done']),
            'invisible': ~Eval('purchase_visible', False),
            },
        depends=['purchase_visible', 'state'])
    estimated_time_delivery = fields.Function(fields.Date('ETD',
        states={
            'invisible': ~Eval('purchase_visible', False),
            }, depends=['purchase_visible']),
        'on_change_with_estimated_time_delivery')

    @fields.depends('planned_date', 'shipping_mode')
    def on_change_with_estimated_time_delivery(self, name=None):
        delivery_date = None
        if self.planned_date:
            delivery_date = self.planned_date
        if delivery_date and self.shipping_mode:
            delivery_date -= timedelta(
                days=self.shipping_mode.lead_time)
        return delivery_date

    @staticmethod
    def order_estimated_time_delivery(tables):
        table, _ = tables[None]
        return [????]