RFC using BPM

Hi People

I am trying to create File to RFC by using BPM, i got 1 blogs form Arpit Seth this is good but i am confusing in ID only i created 1 business service in that i created 3CC 1 is RFC receiver, 2 is File sender 3 is File is receiver this processes is correct are not, and also i am getting problem in Sender agreement, receiver agreement, and receiver determination, interface determination.

Pls tell me the process for this scenario don't send Arpit Seth blog

Regards

shekar