changes()
This method is used to tell if a field within a GlideRecord changes in a business rule.
Parameters: None
Returns: Bool
A boolean representing whether the current field for a record has changed in a business rule.
Mutates Self?
As far as I can tell, no.
Examples:
Script
//current is a GlideRecord('incident') in business rule's script
gs.print(current.sys_updated_on.changes());
Output
true