Ending or Changing Recurrence Loses All Exceptions??

[Fred]

Here's the scenario

Historically, I had set up an appointment to recur once a
week with no end date specified.
Occasionally, I had to change one of the appointments to
a different hour or even had to cancel one of the
appointments.
Now, for the future, if I want to stop or change the
recurring appointment by specifying an end date, a
different new time, or a specified number of
appointments - all previous exceptions (appointments I
already had that were changed)wind up getting moved to
the new appointment slot despite the fact that these
appointments are historical.
Is there a way to keep the history correct?....and change
or end the recurrence?
Help.