BI 4.1 install on same server as 3.1?

Hi,

When BI 4.0 was first released I remember SAP stating that it can be installed side by side with XI 3.1.

I am now hearing that this is no longer the case and that BI 4.1 should be installed on a separate server to XI 3.1.

Can anyone comment on this?

Thanks,

Chris