Help for Scenario! B2B or A2A

Hi,

i am trying to do a scenario with following components:

1. Sender: external SAP R/3 System

2. internal XI System

3. Receiver: external receiver System (via OFTP)

I am a little confused how to realize this. I guess its for sure not an A2A scenario but an B2B.

But how to do this. First i tried to introduce the R/3 to the SLD, guess this is the common way. But how to check the communication?! What do i have to configure in the R/3 System, what in the IB??

I am also thinking of doing an integration process but is it really necessary. Do i mix up something or do i need to do both?!

Your help is highly appreciated!!

greetz