Hi Amit,
Sorry for the late response, i was on off. Thanks a lot for the detailed explanation. I understood a lot about FM Call. I have this requirement can u give me a sample code how to do pls?
I have to extract data from MCHA, AUSP, CABN Tables. By extracting the data from these tables i extract data of 3 fields Batch number (from MCHA), value ( From AUSP) and name (From CABN)
Link between 3 tables:
MCHA and AUSP tables has a common field Obj id,
AUSP and CABN tables has common field Internal char number.
The output will be like this:
Batch Name Value
1001 A 40
1002 B 50
Can u help me pls, I am not having a good ABAP Knowledge. Thanks a lot again for the explanation 
Thanks,
Karthik