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AddEventHandler("iblock", "OnAfterIBlockElementAdd", Array("QA", "AfterQAQuest"));

AddEventHandler("iblock", "OnAfterIBlockElementUpdate", Array("QA", "AfterQAQuest"));

class QA
{
   function AfterQAQuest(&$arFields)
   {
      if($arFields['IBLOCK_ID'] == 13){ 
         if($arFields['ID'] > 0){   
            $arFields['CODE'] = $arFields['ID'].'_'.$arFields['CODE'];
               $el = new CIBlockElement;
               $arLoadProductArray = Array(
                 "MODIFIED_BY"    => $arFields['MODIFIED_BY'],
                 "IBLOCK_SECTION" => false,
                 "PROPERTY_VALUES"=> $arFields['PROPERTY_VALUES'],
                 "NAME"           => $arFields['NAME'],
                 "CODE"         => $arFields['CODE'],
                 "ACTIVE"         => $arFields['ACTIVE'],
                 "PREVIEW_TEXT"   => $arFields['PREVIEW_TEXT']
                 );

               $res = $el->Update($arFields['ID'], $arLoadProductArray);
         }
      }
   }
}