The 'After Field Edit' trigger in NetSuite serves to execute a script after a field on a record has been modified and the focus has moved away from that field. This is essential for executing supplementary business logic that depends on the new value of the recently edited field.
When a field is edited, it may interact with other fields or trigger processes tied to those changes; thus, the 'After Field Edit' trigger allows you to run code or actions that take into account the updated field value once the edit has been finalized. This can include things like recalculating totals, enabling or disabling other fields, or even flagging records based on the new input.
The role of the 'After Field Edit' trigger goes beyond merely waiting for sourcing to occur; it actively engages in performing tasks that react to the new state of the field, which is integral in customizing user interfaces or executing scripts in real-time based on user actions. Consequently, it is this functionality that aligns with the purpose of the 'After Field Edit' trigger.