Проблема с добавлением товаров

      
      $arFields = Array(
         "IBLOCK_SECTION_ID" => 6,         
         "IBLOCK_ID"      => 2, //Каталог товаров
         "NAME"           => "test product",
         "ACTIVE"         => "Y",           
         "PREVIEW_TEXT"   => "текст для списка элементов",
         "DETAIL_TEXT"    => "текст для детального просмотра"
       );

      $el = new CIBlockElement;
      if ($prodid = $el->Add($arFields))
         echo "done ".$prodid;

      $arFields = array(
         "ID" => $prodid, 
         "VAT_ID" => 1, 
         "VAT_INCLUDED" => "Y", 
         "PURCHASING_PRICE" => 100,
         "AVAILABLE" => "Y", 
         "PURCHASING_CURRENCY" => "RUB",
      );

      $cprodid = CCatalogProduct::Add($arFields);


      $arFields = Array(
          "PRODUCT_ID" => $cprodid,
          "CATALOG_GROUP_ID" => 2,
          "PRICE" => 500,
          "CURRENCY" => "RUB",
          "QUANTITY_FROM" => 1,
          "QUANTITY_TO" => 10
      );

      CPrice::Add($arFields);