BOBI 4.1 SP2 Oracle client installation on server

Hi,

In my landscape, we have installed BOBI 4.1 SP2 on windows 2008 and the oracle version is 11g. Everything is working fine except audit configuration. Actually SAP recommended to install both 32 bit oracle and 64 bit oracle client in server. But if we install both version on server then how it will works and how can we set env. variables and TNS entry. Totally confused and am not good at oracle. Any one input is highly appreciated.

Thankig you in anticipation.

Obinna.