I have a Customer table and a Timetable table and layouts to match. On the Timetable I have times and a dropdown list of Customers which comes from the Customer table field 'c_FullName'. This works fine except when I go back to the Customer and make a change (e.g. the spelling of their name) the Timetable does not update. What do I need to do to make the change occur on the Timetable if and when a change is made on the Customer table?