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$arFilter = Array("IBLOCK_ID"=>"ID инфоблока",  "ACTIVE"=>"Y");
$rsProducts = CIBlockElement::GetList(Array(), $arFilter); 
while ($arProduct = $rsProducts->GetNext()){
              ChangeBasePriceById($arProduct["ID"]);
              } 

$rsProducts = CCatalogProduct::GetList(array(),array(),false,false);
while ($arProduct = $rsProducts->Fetch()){
                       ChangeBasePriceById($arProduct["ID"]);
                       }

function ChangeBasePriceById($id){

if(!CModule::IncludeModule('iblock') || !CModule::IncludeModule('currency') || !CModule::IncludeModule('catalog'))
       {
       Echo "Oblom!";
       }
       $PRODUCT_ID = $id;
       $baseAr = CCatalogGroup::GetBaseGroup();
       $PRICE_TYPE_ID = $baseAr["ID"];

       $db_res = CPrice::GetList(
                       array(),
                       array(
                                       "PRODUCT_ID" => $PRODUCT_ID,
                                       "BASE"=>"N"
                               )
               );

       if ($res = $db_res->Fetch())
       {
               $price = $res["PRICE"];
               $currency = $res["CURRENCY"];

               // Обновление базовой стоимости
               $arFields = Array(
                       "PRODUCT_ID" => $PRODUCT_ID,
                       "CATALOG_GROUP_ID" => $PRICE_TYPE_ID,
                       "PRICE" => $price,
                       "CURRENCY" => $currency
                       );

               $res = CPrice::GetList(
                       array(),
                       array(
                                       "PRODUCT_ID" => $PRODUCT_ID,
                                       "CATALOG_GROUP_ID" => $PRICE_TYPE_ID
                               )
               );

       if ($arr = $res->Fetch())
               {
                       
                       
                       $obPrice2 = new CPrice();
$obPrice2->Update($arFields,true);        
                       
               }
               else
{
                       
                       $obPrice = new CPrice();
$obPrice->Add($arFields,true);        
       }

               }

       }