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$eventManager->addEventHandler(    'iblock',
    'Bitrix\Iblock\Property::OnBeforeUpdate',
    static function (\Bitrix\Main\Entity\Event $event) {

        $data = $event->getParameter("fields");
       if ($data["XML_ID"]=='a39493dd'){
               $data["PROPERTY_TYPE"]="E";            
               $data["IBLOCK_ID"]=24;
       }
});

AddEventHandler("iblock", "OnBeforeIBlockPropertyUpdate", Array("MyClass", "OnBeforeIBlockPropertyAddHandler"));

class MyClass
{
    // создаем обработчик события "OnBeforeIBlockPropertyAdd"
    function OnBeforeIBlockPropertyAddHandler(&$arFields)
    {
        if ($arFields["XML_ID"]=='a39493dd'){


            $arFields["PROPERTY_TYPE"]="E";
            $arFields["IBLOCK_ID"]=24;

        }
    }

$eventManager = \Bitrix\Main\EventManager::getInstance();
$eventManager->addEventHandler(
    'iblock',
    '\Bitrix\Iblock\PropertyFeature::OnBeforeUpdate',
    static function (\Bitrix\Main\Entity\Event $event) {
        file_put_contents( __DIR__ . '/__debug.log', var_export( $event->getParameters(), true ) . PHP_EOL, FILE_APPEND );
    }
);