Parking the 'www' subdomain on a different account

Hi! I have the following working right now: - Server A where I park my customers' domains so they all use the same file structure - Server B where I create a mail-only account so they can manage it without having access to my files / other customers' files I'm considering using a single larger server (better performance, lower price), and for testing purposes I tried this: - creating a new account on Server A - deleting it's www cname - parking www. to my domain But whenever I try parking it, cpanel just says it's not allowed to park the "www." subdomain. I know I could do this on apache's vhost, but I wanna do it the "cpanel way". Is there any way to "unlock" this www parking? Thanks in advance. Rodrigo.