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Changes may be needed for a process plan. To make sure the history of all changes is kept, different versions of the process plan are created. The copy version button is used to duplicate existing versions of the same process plan for re-use. The copied version is updated with the required changes.

Each version has a starting date and an ending date.

The estimated time field is populated with the value of the accumulation of the estimated time of all the operations in the process plan. The information is updated by the application each time an estimated time is entered and saved on an operation.