No notifications when stock changed from other plugin

Hi!

Thanks a lot for this nice plugin!

I use this plugin to change stock levels:
http://holest.com/index.php/holest-outsourcing/joomla-wordpress/excel-like-manager-for-woocommerce-and-wp-e-commerce.html

I think it uses directly “update_post_meta” to change stock levels. (at least that is what I saw in the code).

However, when I use that plugin to change the stocks, there is no notification sent out to subscribed customers.

What should I tell the developer of this other pluging he has to change to make it work with your plugin? Is there another function that he should call instead of update_post_meta?

Best Regards!
Chris