I'm trying to fine tune a form and would like to have combo box BOAOperator become a required field if the selection in combo box BOARunResults equals either 'Nominal' or 'Off Nominal'. If it matters, I could make BOAOperator required and un-require it if BOARunResults equaled 'Did Not Participate'.
I think this would be some type of validation rule, but I'm not sure how to do it.