To cancel a preparation request, you have two options:
FROM THE STOCK
Choose the chassis. In the Action menu and under the Logistics operation tab, choose Cancel the preparation request. A pop-up will indicate to you that the cancellation has been recorded.
FROM THE CALENDAR
In the calendar, click on the preparation event. The pop-up window will display chassis concerned and in the Preparation actions dropdown menu, you can modify, cancel or verify the preparation.