Calling Function in v7 and v8

   


  def cancel_confirmed(self, cr, uid, ids, context=None):
        obj = self.browse(cr,uid,ids,context)
        active_id = int(obj.active_id)
        active_model = obj.active_model
        reason = obj.reason

     
        if active_model == 'purchase.order':

            self.pool.get('purchase.order').action_cancel(cr,uid,[active_id],context)
            self.pool.get('purchase.order').write(cr,uid,[active_id],{'od_cancel_reason':reason},context)

        elif active_model == 'stock.picking':

            self.pool.get('stock.picking').action_cancel(cr,uid,[active_id],context)
            self.pool.get('stock.picking').write(cr,uid,[active_id],{'od_cancel_reason':reason},context)

        elif active_model == 'sale.order':

            self.pool.get('sale.order').action_cancel(cr, uid, [active_id], context)
            self.pool.get('sale.order').write(cr,uid,[active_id],{'od_cancel_reason':reason},context)

        elif active_model == 'account.voucher':
            self.pool.get('account.voucher').cancel_voucher(cr,uid,[active_id],context)

            self.pool.get('account.voucher').write(cr,uid,[active_id],{'od_cancel_reason':reason},context)


     
        return True


#account invoice written in new api
    @api.multi
    def action_cancel_for_invoice(self):
        active_id = int(self.active_id)
        reason= self.reason
        acco = self.env['account.invoice'].browse(active_id)
        acco.action_cancel()
        acco.write({'od_cancel_reason': reason})
        return True