When you edit a Recurring Aero, Aero will apply to those updates to all unchanged occurrences. How do you know which occurrences are changed?
Let's take a look at a list of occurrences in a Recurring Aero:
You'll notice that there is a column called Is Changed and the first occurrence in the list, which has been completed, says Yes in the Is Changed column. This is how Aero knows not to update that particular occurrence if any changes are made to the Recurring Aero.
Most often, a changed occurrence is one that has the Status of Completed, Deferred, or In Progress.