Need to Clear field on a Validation Business Rule

[DeepThinker]

The following BR message is checking to make sure the actual start date is not before the Planned start date on a change. then is throws a message. Can someone help with how I would clear the work_start field in addition to this message. 

I've tried "g_form.clearValue('work_start');" before the Abort but this did not work. I think I'm missing an if statement but I don't know how to write it. 

Here is the script:

(function executeRule(current, previous /*null when async*/) {
gs.addErrorMessage(gs.getMessage("{0} must be after {1}", [ current.work_start.getLabel(), current.start_date.getLabel() ]));

current.setAbortAction(true);


})(current, previous);

[DeepThinker]

This worked beautifully if the user manually updated the Actual start but it failed to work when the "Implement" UI Action is clicked. Any ideas?