- Add a new tab to the form.
- In the visibility section of tab unctick the "Visible by default" checkbox .
- In the field explore window untick "Only shows unused fields". It will display all the available entity fields in the list.
- Add the fields to this newly created tab. ( Fields that are also present on the locked section)
- Add the "On Change" event to one of the field.
- Save the changes and publish the entity.
- Now if you change the value of field in the locked section, it will trigger the event you defined in the newly created tab's field.