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AddEventHandler("sale", "OnBeforeOrderUpdate", "OnBeforeOrderUpdateHandler");  
function OnBeforeOrderUpdateHandler($ID, $arFields) { 
   $arOrder = $ID;
   $itemsSaleOrder = CSaleOrder::GetList(array(), array('ID'=>$arOrder), false, false);
   $itemsSaleBasket = CSaleBasket::GetList(array(), array('ORDER_ID' => $arOrder), false, false, array()); 
   $dom = new DomDocument('1.0','Windows-1251'); 
   $zakaz = $dom->appendChild($dom->createElement('zakaz')); 
   while ($items = $itemsSaleOrder->Fetch()) {  
      foreach ($items as $keyOrderNew => $valueOrderNew) {
         foreach ($arFields as $keyOrderOld => $valueOrderOld) {
            if ($keyOrderNew != $keyOrderOld) {
               if ($valueOrderNew == $valueOrderOld) {
                  $Element = $zakaz->appendChild($dom->createElement($keyOrderNew));
                  $Element->appendChild($dom->createTextNode(iconv("windows-1251", "UTF-8", $valueOrderNew)));   
               }
            }
         }
      }
   } 
   $itemsList = $zakaz->appendChild($dom->createElement('ItemsList'));      
   while ($items = $itemsSaleBasket->Fetch()) {
      $item = $itemsList->appendChild($dom->createElement('Item'));
      foreach ($items as $keySaleBasketOld=>$valueSaleBasketOld) {
         foreach ($arFields["BASKET_ITEMS"] as $basketItemsKey=>$basketItemsDate) {
            foreach ($basketItemsDate as $keySaleBasketNew => $valueSaleBasketNew) {
               if ($items["PRODUCT_ID"] == $basketItemsDate["PRODUCT_ID"]) {
                  if ($keySaleBasketOld == $keySaleBasketNew) {
                     if ($valueSaleBasketOld != $valueSaleBasketNew) {
                        $Element = $item->appendChild($dom->createElement($keySaleBasketNew));
                        $Element->appendChild($dom->createTextNode(iconv("windows-1251", "UTF-8", $valueSaleBasketNew)));
                     }
                  }
               }
            }
         } 
      }
   }
   $dom->formatOutput = true; 
   $test = $dom->saveXML(); 
}