RFC To File Scenario

Hi,

I need to Configure a Scenario in such a way that when I Execute RFC

(Asynchronous without using BPM) the Output should be Sent to File by using XI.

Imported RFC.

While Creating Message mapping it should be Request or Response for RFC structure for source target?

I want to know one more thing when to use request & response structure of RFC while RFC is a sender interface?

Created a File Data type, Message Type, Inbound Asyn Message Interface.

Thanks in Advance.

Anuj Agarwal