Hi Masoumesh,
We have to install Bw and ECC (r/3) in diff servers.
Installation of bw and r/3 is part of BASIS consultants, ETL and reporting part taken care by Bw consultants.
.
As you said above if you are running FI,PP,IM you are reporting on OLTP.
If you want to run SAP BI, BI reports on OLAP
R/3 is two dimensional data( rows & columns )OLTP
BI is Multidimensional data OLAP
we have different versions in SAP Business Intelligence, Bw 3.5V/ BI7.0V/ Bw 7.3V...
Coming to R/3 Versions R/3 4.7, ECC 6.0.
Regards,
Naga.