EventManager::getInstance()->addEventHandler(
'iblock',
'OnBeforeIBlockPropertyUpdate',
["ImportFrom1s","OnBeforeIBlockPropertyUpdate"]
);
public static function OnBeforeIBlockPropertyUpdate(&$arFields)
{
if (isset($_GET['type'], $_GET['mode']) && $_GET['type'] === 'catalog' && $_GET['mode'] === 'import')
{
unset($arFields["NAME"]);
}
}