[cobalt-users] same domain name, different host name question

[jale@xxxxxxxxxx]

I have a domain www.domain.com
I want to have another (on the same or a different IP) jale.domain.com

When I try to create the new site with host name jale and domain name 
domain.com it tells me:
Another site is already aliased to the domain domain.com

I thought this should be valid, 2 machine/host names on the same domain. Am 
I missing the boat on something?

Thanks,
Jale