Global Change - Change Resource price/unit

My problem is that I'm trying to use Global change  to change the price/unit. I'm currently using P6.2.

I looked here on the Knowledge database for an answer and the one that was provided was basically the one I'm trying to use. I set the Subject area to "Activity Resource Assignments". I then use the following If/Then statement

Where Resource ID Name eguals MW

Then Rate Source equals Override and Price/Unit equals $XX.

I know I've done something like this before, but I don't know what I'm doing wrong right now. Or it just might be the client install