Editing Movements or Aircraft Logs - Redcrest-Solutions/FlyingFleet-issues GitHub Wiki
If an admin edits either a movement or an aircraft log (edit or delete), Flying Fleet will try to correct the corresponding bill as long as there is only bills in draft or current state linked to the movement or the aircraft log. This is to avoid any modification of a bill once it has been sent to the customer.
Therefore if a customer contact the accounting staff to modify a bill for example to reduce the number of landings, the accounting person must edit the movement AND modify (using the "replace with" action) the bill.
Deleting either the movement or the aircraft log will cut the link between the bill transaction and the log entry, but will leave the bill transaction otherwise untouched.