Originally Posted by
panjfj
The agent is telling me about fare structures and stuff that dont make sense as there is either R or no R.
You are not correct about that (R or no R). Availability can (and frequently does) depend on routing. It's called "married segments" and there are numerous discussions of it on here.
A recent one:
http://www.flyertalk.com/forum/unite...ment-hell.html