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function myFunction(Main\Event $event) {
   $order = $event->getParameter("ENTITY");
   $res = CSaleBasket::GetList(array(), array("ORDER_ID" => $order->getField("ID")));
   
   $items = array();
   
   while ($arItem = $res->Fetch()) { 
      $items .= $arItem['PRICE_TYPE_ID'].';';
   }
   
   ///$order->setField("PRICE_TYPE", $items);

  
    $propertyCollection = $order->getPropertyCollection();
        
    $propsData = [];

    foreach ($propertyCollection as $propertyItem) {
        if (!empty($propertyItem->getField("CODE"))) {
            $propsData[$propertyItem->getField("CODE")] = trim($propertyItem->getValue());
        }
    }

    foreach ($propertyCollection as $propertyItem) {

        switch ($propertyItem->getField("CODE")) {
            case 'PRICE_TYPE':
               AddMessage2Log('Условие сработало');
                $propertyItem->setField("VALUE", $items);
                break;
        }
    }
    
    

   
   AddMessage2Log($items);

}