/**
  * Creates a duplicate report line.
  *
  * @param Varien_Object $report
  * @param string        $sequenceId
  * @param string        $reference
  * @param string        $message
  *
  * @return Varien_Object
  */
 protected function _createDuplicateReportLine($report, $sequenceId, $reference, $message)
 {
     $report->setDuplicates($report->getDuplicates() + 1);
     return $this->_createReportLine($reference, $sequenceId, $message, 'Duplicate');
 }