Connect one SAP BW system to multiple R/3 systems

Hi All,

Has anyone done a connection of one SAP BW system to multiple SAP R/3 systems. I know it is theretically possible, but please let me know if anybody has experience of doing it. Our scenario is that take HR data from one R/3 system and other modules data from another R/3 system.

Also please let me know the steps of connecting the systems, the do's and dont's and any special config that needs to be done.

Also what are the risks?

Thanks in advance.

Regards,

Rajib