SOAP to File

I am trying to implement SOAP to File scenario and i am using sync/async bridge.

I used this blog to create message interface and IP,

I am little confused with , how many mappings do i need to have in my interface.

/people/sriram.vasudevan3/blog/2005/01/11/demonstrating-use-of-synchronous-asynchronous-bridge-to-integrate-synchronous-and-asynchronous-systems-using-ccbpm-in-sap-xi

could anyone help me to telll how many mappings do i need to create in my interface?

Thanks,

Pranav