Обновление цены из 1с (CIBlockCMLImport->SetProductPrice())

   function SetProductPrice($PRODUCT_ID, $arPrices, $arDiscounts = false)
   {
      if(is_array($arDiscounts) && count($arDiscounts) > 0)
      {
         if(!array_key_exists(1, $arDiscounts))
            $arDiscounts[1] = 0;
         ksort($arDiscounts);
         $prev = 0;
         foreach($arDiscounts as $volume => $percent)
         {
            if($prev > 0)
            {
               $arDiscounts[$prev] = array(
                  "QUANTITY_FROM" => $prev,
                  "QUANTITY_TO" => $volume - 1,
                  "PERCENT" => $arDiscounts[$prev],
               );
            }
            $prev = $volume;
         }
         $arDiscounts[$prev] = array(
            "QUANTITY_FROM" => $prev,
            "QUANTITY_TO" => "",
            "PERCENT" => $arDiscounts[$prev],
         );
      }
      else
      {
         $arDiscounts =  array(
            array(
               "QUANTITY_FROM" => "",
               "QUANTITY_TO" => "",
               "PERCENT" => 0,
            ),
         );
      }

      $arDBPrices = array();
      $rsPrice = CPrice::GetList(array(), array("PRODUCT_ID" => $PRODUCT_ID));
      while($ar = $rsPrice->Fetch())
         $arDBPrices[$ar["CATALOG_GROUP_ID"].":".$ar["QUANTITY_FROM"].":".$ar["QUANTITY_TO"]] = $ar["ID"];

      if(!is_array($arPrices))
         $arPrices = array();

      foreach($arPrices as $key=>$price)
      {

         if(!isset($price[GetMessage("IBLOCK_XML2_CURRENCY")]))
            $price[GetMessage("IBLOCK_XML2_CURRENCY")] = $price["PRICE"]["CURRENCY"];

         $arPrice = Array(
            "PRODUCT_ID" => $PRODUCT_ID,
            "CATALOG_GROUP_ID" => $price["PRICE"]["ID"],
            "^PRICE" => $this->ToFloat($price[GetMessage("IBLOCK_XML2_PRICE_FOR_ONE")]),
            "CURRENCY" => $this->CheckCurrency($price[GetMessage("IBLOCK_XML2_CURRENCY")]),
         );

         foreach($arDiscounts as $arDiscount)
         {
            $arPrice["QUANTITY_FROM"] = $arDiscount["QUANTITY_FROM"];
            $arPrice["QUANTITY_TO"] = $arDiscount["QUANTITY_TO"];
            if($arDiscount["PERCENT"] > 0)
               $arPrice["PRICE"] = $arPrice["^PRICE"] - $arPrice["^PRICE"]/100*$arDiscount["PERCENT"];
            else
               $arPrice["PRICE"] = $arPrice["^PRICE"];

            $id = $arPrice["CATALOG_GROUP_ID"].":".$arPrice["QUANTITY_FROM"].":".$arPrice["QUANTITY_TO"];
            if(array_key_exists($id, $arDBPrices))
            {
               CPrice::Update($arDBPrices[$id], $arPrice);
               unset($arDBPrices[$id]);
            }
            else
            {
               CPrice::Add($arPrice);
            }
         }
      }

      foreach($arDBPrices as $key=>$id)
         CPrice::Delete($id);
   } 

      foreach($arDBPrices as $key=>$id)
         CPrice::Delete($id);