ABAP Web Service using RFC target sys

Hello!

I have a question regarding calling an ABAP Web Service from an outside application to return data from our R/3 system (4.6c). We have an ABAP web service set up on an NW04 system that replicates the function on R/3 and when I call it using the correct RFC target system (the R/3 system), I get the results and everything is great.

My question is: Is it possible to set up an ABAP web service to populate that RFC target system (to point to R/3), or does that have to be done inside the function module (by calling the function module with the destination)?

Thanks!

John