public function outstanding_transactions()
 {
     if (!$this->loadData()) {
         $this->dataError();
         sendBack();
     }
     $customer = $this->_uses[$this->modeltype];
     $category = DataObjectFactory::Factory('LedgerCategory');
     $categories = $category->checkCompanyUsage($customer->company_id);
     // Check for Sales Ledger account and Contra Control account
     $glparams = DataObjectFactory::Factory('GLParams');
     // Does this SL Customer also have a PL Supplier account
     // and does the Contras Control Account also exist
     // if so, then allow contras
     $can_contra = isset($categories['PL']['exists']) && $categories['PL']['exists'] && $glparams->contras_control_account() != FALSE;
     $this->view->set('can_contra', $can_contra);
     $transaction = DataObjectFactory::Factory('SLTransaction');
     $transactions = new SLTransactionCollection($transaction);
     $db = DB::Instance();
     $sh = $this->setSearchHandler($transactions);
     $sh->addConstraint(new Constraint('status', 'in', '(' . $db->qstr($transaction->open()) . ',' . $db->qstr($transaction->partPaid()) . ')'));
     $sh->addConstraint(new Constraint('slmaster_id', '=', $customer->id));
     parent::index($transactions, $sh);
     if ($can_contra) {
         // create session object to handle paged data input
         $contras_sessionobject = new SessionData('sl_contras');
         if (!$contras_sessionobject->PageDataExists()) {
             // session object does not exist so register it
             $contras_sessionobject->registerPageData(array('os_value', 'contra'));
         }
         // Check for form input due to paging or ordering
         if (isset($this->_data['SLTransaction'])) {
             foreach ($this->_data['SLTransaction'] as $id => $fields) {
                 if ($fields['contra'] == 'on') {
                     $contras_sessionobject->updatePageData($id, $fields, $errors);
                 } else {
                     $contras_sessionobject->deletePageData($id);
                 }
             }
         }
         $contras_data = $contras_sessionobject->getPageData($errors);
         $contra_total = 0;
         foreach ($contras_data as $value) {
             if (isset($value['contra']) && $value['contra']) {
                 $contra_total += $value['os_value'];
             }
         }
         $this->view->set('contra_total', $contra_total);
         $this->view->set('page_data', $contras_data);
     }
     $this->view->set('ledger_account', $customer);
     $this->view->set('collection', $transactions);
     $this->view->set('clickaction', 'view');
     $this->view->set('clickcontroller', 'sltransactions');
     $this->view->set('invoice_module', 'sales_invoicing');
     $this->view->set('invoice_controller', 'sinvoices');
     $this->_templateName = $this->getTemplateName('view_ledger_trans');
 }