How to post only one side of link variable?

I can’t seem to recreate the selection criteria used in the Posting Selection dialogue box that would limit posting of link variables to one side where they are identical for both directions (street names, for example). I would greatly appreciate if someone could repost this tip/how-to.

If you’re in a .NET environment, you could use something like this as your selection criteria:
[ATTRIBUTE] <> [ATTRIBUTE].R | A < B

Thanks: exactly what I needed!