static function displayTabContentForItem(CommonGLPI $item, $tabnum = 1, $withtemplate = 0)
 {
     if (get_class($item) == 'Supplier') {
         PluginOrderReference_Supplier::showReferencesFromSupplier($item->getField('id'));
         self::showDeliveries($item->getField('id'));
         PluginOrderSurveySupplier::showGlobalNotation($item->getField('id'));
     } elseif (get_class($item) == 'PluginOrderOrder') {
         $order_supplier = new self();
         self::showOrderSupplierInfos($item->getID());
         if (!$order_supplier->checkIfSupplierInfosExists($item->getID()) && $item->can($item->getID(), 'w')) {
             self::showOrderSupplierInfos($item->getID());
             $order_supplier->showForm("", array('plugin_order_orders_id' => $item->getID()));
         }
     }
     return true;
 }