Reset on Edit with Expression not resetting to initial value

[Daisy_Ramirez]

I have Reset on Edit selected for a field [TRUCK NUMBER] and the initial value is blank. I’m using the following expression to trigger the reset but it doesn’t seem to trigger the change. When I change the Division field, the Vehicle Number field maintains the original entry. Is the Reset on Edit not intended to work with an expression like this?

[_THISROW_BEFORE].[Division]<> [_THISROW_AFTER].[Division]