Hi.
I found the problem.
Basicaly it working. But when you delete the parked domain, whm does not delete it from httpd.conf file. And when you add this domain again it creates a new entry in httpd.conf. Also, when you park it on subdomain the parked domain will work correctly but subdomain.domain.com will no longer work, it will show your main account. To fix it you should manualy modify the httpd.conf

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Good luck.
BUG was already reported.
http://web.cpanel.net/bugzilla/show_bug.cgi?id=350