rewrite function

    include = fields.Boolean("Include", states={'readonly': Eval('state') != 'draft'})

    def compute_next_invoice_date(self):

        date = super(Subscription, self).compute_next_invoice_date()

        if(self.include and not self.next_invoice_date):

            return self.invoice_start_date or self.start_date

#    def compute_next_invoice_date(self):

#        date = super(Subscription, self).compute_next_invoice_date()

#        if(self.include and not self.next_invoice_date):

#            return self.invoice_start_date or self.start_date

#        else:

#            return date

    @classmethod

    @ModelView.button

    @Workflow.transition('running')

    def run(cls, subscriptions):

        pool = Pool()

        Line = pool.get('sale.subscription.line')

        lines = []

        for subscription in subscriptions:

            if not subscription.next_invoice_date:

                if subscription.include:

                    subscription.next_invoice_date = (subscription.invoice_start_date or subscription.start_date)

                else:

                    subscription.next_invoice_date = (subscription.compute_next_invoice_date())

            for line in subscription.lines:

                if (line.next_consumption_date is None

                        and not line.consumed):

                    if subscription.include:

                        subscription.next_invoice_date = (subscription.invoice_start_date or subscription.start_date)

                    else:

            return date

 No newline at end of file

                        line.next_consumption_date = (line.compute_next_consumption_date())

            lines.extend(subscription.lines)

        Line.save(lines)

        cls.save(subscriptions)

 No newline at end of file