The answer is probably right in front of my face, but I'm not seeing it. I'm trying to use a Public Parameter, MG say, in the Dataset for the Bentley MicroStation Design (V7) data Reader to specify the top level directory containing all my design files. I am entering $(MG)\\**\\*.dgn in the Dataset and when I click OK to save the Reader, I get the error "Undefined macro 'MG' dereferenced in file ...." Program Terminating.
I'm using FME 2013 Workbench. Any hint in the right direction would be appreciated.
Steve