Hi,
Well, it's not really something compatible with the Joomla SEF system.
You can have such url if you create a joomla menu entry.
I guess that ACESEF when it have a 404 page, asked for the components if there is something which want to catch the url.
Or it has to stored all links in a database and at this moment it's like creating one menu per article.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.