Question I have a problem set cname alias to subdomain.

[WinT]

I have a problem set cname. Please help me.

My config information is
1. I have first domain (for example) "www.mainweb.com" and I create subdomain "report.mainweb.com" both places has a different interface.
2. I have second domain "www.secondweb.com" and I used name server "ns1.dns-diy.net" set dns is
- "A" value = "xxx.xxx.xxx.171"
- "CNAME" value = "report.mainweb.com"
3. At plesk control I add domain alias "www.secondweb.com" in www.mainweb.com

Problem is I access "www.secondweb.com" it go to www.mainweb.com. It does not go to "report.mainweb.com"
Do you have any technical suggestions to config?

Thanks,