Upstream server & Replica can share the same DB ?

Hi,

I tried to install WSUS Replica Server and i choose to use the same primary WSUS server "choos exist" for testing and it work with no warning or errors..

But with some searching i found people comments that it can't be or wrong.

and i found in this link

 http://technet.microsoft.com/en-us/library/dd939812(v=ws.10).aspx

"If you install multiple WSUS servers, you must maintain a separate database for each WSUS server, whether it is an autonomous or a replica server."

Appreciate to know is there any problem using the same DB or not .. Thanks