This field is located within the Bookings Additional Info Summary

It automatically updates in any of the following fields are changed:

- Booking name

- Booking status or status date

- Booking pipeline stage

- Assigned user

- Booking start/end date/time

- Deal value

- Inquiry date

- Booking type

- Referral source

- Lost reason

- Lost comment

In addition to this, it will also update when:

- Primary contact is changed

- An Account is added or removed

- A Travel Agent is added or removed