(self)
return (
            self.subscription.date_start if self._subscription_starts_after_invoice
            else None
        )
If there are multiple subscriptions in this invoice, only count the
        sms billables that occur AFTER this date for this line item.
        Otherwise, excess billables will be counted counted twice in both
        subscription timeframes.
If there are multiple subscriptions in this invoice, only count the
        sms billables that occur AFTER this date for this line item.
        Otherwise, excess billables will be counted counted twice in both
        subscription timeframes.
If there are multiple subscriptions in this invoice only count the sms billables that occur AFTER this date for this line item . Otherwise excess billables will be counted counted twice in both subscription timeframes .
def _start_date_count_sms(self):
        """If there are multiple subscriptions in this invoice, only count the
        sms billables that occur AFTER this date for this line item.
        Otherwise, excess billables will be counted counted twice in both
        subscription timeframes.
        """
        return (
            self.subscription.date_start if self._subscription_starts_after_invoice
            else None
        )
def _start_date_count_sms ( self ) : return ( self . subscription . date_start if self . _subscription_starts_after_invoice else None )