loop problem in a MDM workflow

Hi MDM experts,

I have just read Ketan Phanse article about loop scenarios in MDM workflow. It's clear and interesting.

What I don't understand is how I can create a branch step and the validation rule where I test the approve or reject request.

I can drag and drop the branch stencil in my workflow model but I can't know how to write the validation rule: what are the validation expressions i for testing the approve or reject requests?

Any suggestions and help are appreciate.

Thanks

SB