protected function ResolveExternalKey($aRowData, $sAttCode, &$aResults)
 {
     $oExtKey = MetaModel::GetAttributeDef($this->m_sClass, $sAttCode);
     $oReconFilter = new DBObjectSearch($oExtKey->GetTargetClass());
     foreach ($this->m_aExtKeys[$sAttCode] as $sForeignAttCode => $iCol) {
         if ($sForeignAttCode == 'id') {
             $value = (int) $aRowData[$iCol];
         } else {
             // The foreign attribute is one of our reconciliation key
             $oForeignAtt = MetaModel::GetAttributeDef($oExtKey->GetTargetClass(), $sForeignAttCode);
             $value = $oForeignAtt->MakeValueFromString($aRowData[$iCol], $this->m_bLocalizedValues);
         }
         $oReconFilter->AddCondition($sForeignAttCode, $value, '=');
         $aResults[$iCol] = new CellStatus_Void($aRowData[$iCol]);
     }
     $oExtObjects = new CMDBObjectSet($oReconFilter);
     $aKeys = $oExtObjects->ToArray();
     return array($oReconFilter->ToOql(), $aKeys);
 }