Connecting SAP source system to BI system:
To see the connections in SAP system(between R/3 and BW system)
TCODE: SM59In R/3 system:
Look for B3TCLNT800(BW logical source system name in R/3)
Double click on b3tclnt800
Under bw system enter SM59:
Look for T90CLNT090(R/3 logical source system name in BW)
We can also check the dialog defined for SAP R/3 and BW systems(SAME AS BEFORE). The dialogs are also necessary for the communication between the systems.