[support] Clean URL's and multipple paths

I have a scenario where the same content needs to be accessed via different url's. It's content is created with pagemanager The page "contact" needs to be accessable via: mydomain.com/contact mydomain.com/subsite1/contact mydomain.com/subsite2/contact Therefor, I created two aliases that point to "contact". The problem is that the url's are rewritten to mydomain.com/subsite2/contact no matter wich url I type. The content is correct only the path is wrong. How can I force that the right path is used? Thanks