/**
  * @return Pap_Db_CommissionType
  */
 private function loadCommissionType($commTypeId) {
     if (!array_key_exists($commTypeId, self::$commissionTypesCache)) {
         $commissionType = new Pap_Db_CommissionType();
         $commissionType->setId($commTypeId);
         try {
             $commissionType->load();
         } catch (Gpf_Exception $e) {
             $commissionType->setName($this->_('Unknown'));
         }
         self::$commissionTypesCache[$commTypeId] = $commissionType;
     }
     return self::$commissionTypesCache[$commTypeId];
 }