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AddEventHandler("iblock", "OnBeforeIBlockElementAdd", "AddElementCode"); 
AddEventHandler("iblock", "OnBeforeIBlockElementUpdate", "AddElementCode"); 

function AddElementCode(&$arFields) 
{ 
   if (isset($arFields["PROPERTY_VALUES"][82]) && count($arFields["PROPERTY_VALUES"][82]) > 0 && $arFields["IBLOCK_ID"] == 15) 
   {
         foreach ($arFields["PROPERTY_VALUES"][82] as $value) 
         {
               if($arFields["CODE"] != $value) 
               {
            $arFields['CODE'] = $value;   
               }
         }
   }
}
 

               if($arFields["CODE"] != $value) 
               {
               $arFields['CODE'] = $value;   
               }

               if($arFields["CODE"] != $value["VALUE"]) 
               {
               $arFields['CODE'] = $value["VALUE"];   
               }