If you create overlapping appointments in a schedule that allows double booking, and have a schedule view that contains only that schedule, then in the Workflow|Schedule screen, the slot times are wrong - they just increase down the page whereas they should reflect the appointment.

With a schedule view that contains multiple schedules, things work correctly - you just get an extra column to show the overlapped appointments.

See http://demo.openvpms.org/alpha/app/1 Main Clinic, 18/6/2013 and switch between the Main Schedule View and Test views.  The notes for the appointment document the times and order of making the appointment.

Regards, Tim G