@classmethod
    def write(cls, *args):
        actions = iter(args)
        args = []
        for sales, values in zip(actions, actions):
            for sale in sales:
                values = values.copy()
                if (values.get('initial_sale_date') is None
                        and values.get('sale_date') is not None):

                    values['initial_sale_date'] = values.get('sale_date')
                args.extend(([sale], values))
        super().write(*args)