@property
def validate(self) -> bool:
    self.stock_error((lambda : self.total_order), f'Total order in discount row is required. Total order = {self._total_order}')
    return super().validate
@property
def validate(self) -> bool:
    self.stock_error((lambda : self.total_order), f'Total order in discount row is required. Total order = {self._total_order}')
    return super().validate