Behaviors - Setting conditionally hidden field mandatory only when visible

[Steve Letch]

Hi

I have a field that is only visible if another field is set to a specific option on the previous step. What I'm unable to do is have the conditional field be mandatory ONLY when it's visible

Here's my current script

 def dropDown = getFieldById("customfield_12200")
def conditionA = getFieldById("customfield_13105")
log.debug("dropdown value" + dropDown.getValue())

if (dropDown.getValue() != "SC-229") {
conditionA.setHidden(true);
}