I have a requirement to call a custom R/3 RFC in a third part tool. We are planning to expose this RFC as a web service via PI. I am not sure how to expose this RFC using PI. I have been told that it's really simple, but being new to PI, i don't wanna screw anything up.? I did try to search, but didn't find anything relative or simple enough for a beginner. Any documentation or related link would be really helpfull.