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CModule::IncludeModule("sale");
$ORDER_ID = 12;
$dbBasket = CSaleBasket::GetList(array(), array("ORDER_ID"=>$ORDER_ID), false, false, array('*'));
while ($arBasket = $dbBasket->Fetch()){
  $arFields = array(
    "QUANTITY" => 2,
  );
  if (CSaleBasket::Update($arBasket['ID'], $arFields)) {
    echo "ok";
  }
  else {
    echo "error";
  }
}