Locking Product Schedules when Re-Calculating

When modifying Product Schedules on an Opportunity, you edit the Booked Amount or Booked Quantity fields, depending on which type of schedules you use.

Viewing the Manage Schedules page, you will see that the values in the Booked Amount column are always editable. However, you can add a locked checkbox to the page via the schedule layout edit fieldset. When set to true on a Product Schedule, this prevents the schedule from being recalculated in the auto-calculate or revert function. You can still edit the dates and status of schedules on locked schedules. Only the amount or quantity fields become locked.