Отображение артикула в составе заказа.

                        $arBasketList[] = $arItem;

$listIdelement[] = $arItem['PRODUCT_ID'];

$tempsElement = CIBlockElement::GetList(array(),
   array(
      'IBLOCK_ID' => //тут значение ID инфоблока каталога,
      'ID'=> $listIdelement
   ),
   false,
   false,
   array(
      'ID', 'IBLOCK_ID', 'PROPERTY_XXXX' //вместо ХХХХ подставляем код свойства в котором хранится артикул
   )

)

while($elements = $tempsElement->GetNext()){
   $listElem[$elements['ID']] = $elements['PROPPERTY_XXXX_VALUE'];
}

$rsProp = CIBlockProperty::GetList(Array("sort"=>"asc", "name"=>"asc"), Array("IBLOCK_ID"=>$arCurrentValues["IBLOCK_ID"], "ACTIVE"=>"Y"));

while ($arr=$rsProp->Fetch()) {
  ...
  if($arr["PROPERTY_TYPE"]!="F") {
    //Пропускает либо список, либо привязку к элементам 
    if($arr["MULTIPLE"] == "Y")
       $arProperty_X[$arr["CODE"]] = "[".$arr["CODE"]."] ".$arr["NAME"];
    elseif($arr["PROPERTY_TYPE"] == "L")
       $arProperty_X[$arr["CODE"]] = "[".$arr["CODE"]."] ".$arr["NAME"];
    elseif($arr["PROPERTY_TYPE"] == "E" && $arr["LINK_IBLOCK_ID"] > 0)
       $arProperty_X[$arr["CODE"]] = "[".$arr["CODE"]."] ".$arr["NAME"];
  }
}

while ($arItem = $dbBasketItems->Fetch())
                    {
                        if (CSaleBasketHelper::isSetItem($arItem))
                            continue;

                        $arBasketList[] = $arItem;
                        
                        $db_props = CIBlockElement::GetProperty(
                            2, //тут значение ID инфоблока каталога,
                            $arItem['PRODUCT_ID'], 
                            "sort", 
                            "asc",  
                            Array("CODE" => "ARTNUMBER")
                        );
                        if($ar_props = $db_props->Fetch())
                            $listElemArt[$arItem['PRODUCT_ID']] = $ar_props["VALUE"]." - ";
//                        else
//                            $listElemArt[$arItem['PRODUCT_ID']] = "";
                        
                    }

                    $arBasketList = getMeasures($arBasketList);

                    if (!empty($arBasketList) && is_array($arBasketList))
                    {
                        foreach ($arBasketList as $arItem)
                        {
                            $measureText = (isset($arItem["MEASURE_TEXT"]) && strlen($arItem["MEASURE_TEXT"])) ? $arItem["MEASURE_TEXT"] : GetMessage("SOA_SHT");

                            $strOrderList .= $listElemArt[$arItem['PRODUCT_ID']].$arItem["NAME"]." - ".$arItem["QUANTITY"]." ".$measureText.": ".SaleFormatCurrency($arItem["PRICE"], $arItem["CURRENCY"]);
                            $strOrderList .= "\n";
                        }
                    }

$strOrderList = "";
               $arBasketList = array();
               $dbBasketItems = CSaleBasket::GetList(
                     array("ID" => "ASC"),
                     array("ORDER_ID" => $arResult["ORDER_ID"]),
                     false,
                     false,
                     array("ID", "PRODUCT_ID", "NAME", "QUANTITY", "PRICE", "CURRENCY", "TYPE", "SET_PARENT_ID")
                  );
               while ($arItem = $dbBasketItems->Fetch())
               {
                  $ar_res = CCatalogProduct::GetByIDEx($arItem["PRODUCT_ID"]);
                  if (CSaleBasketHelper::isSetItem($arItem))
                     continue;

                  $arBasketList[] = $arItem;
               }

               $arBasketList = getMeasures($arBasketList);

               foreach ($arBasketList as $arItem)
               {
                  $measureText = (isset($arItem["MEASURE_TEXT"]) && strlen($arItem["MEASURE_TEXT"])) ? $arItem["MEASURE_TEXT"] : GetMessage("SOA_SHT");

                  $strOrderList .=$ar_res['PROPERTIES']['zakaz']['VALUE']." - ".$ar_res['PROPERTIES']['CML2_ARTICLE']['VALUE']." - ".$arItem["NAME"]." - ".$arItem["QUANTITY"]." ".$measureText.": ".SaleFormatCurrency($arItem["PRICE"], $arItem["CURRENCY"]);
                  $strOrderList .= "\n";
               }