If someone changes working pattern, the number of approved hours booked should be automatically changed to match the new work pattern, e.g.:

• 8 hrs was booked off on a Friday, after the work pattern change Fridays will be non-working days. This booking should be cancelled and the 8 hours put back on their balance.
• 8 hrs was booked off on a Monday, after the work pattern change Mondays will change from being an 8 hour day to a 5.5 hour day. This This should be automatically reduced to 5.5 hours and the extra 2.5 hours put back on their balance.

Manually adjust existing bookings in this way to conform to a new work pattern can amount to a lot of work, be prone to human error, and potentially send out email notifications leading to confusion.