"Production Planning" category
The production planning of a project can be found in the Project Cockpit dialog. The project duration, quantities and surcharges are defined here.

"Production Period" group
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"Begin (SOP)" combobox with arrow keys:
Enter the month and year in which the calculation begins.
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"Duration":
Enter the project period. The project end date (EOP) is automatically set.
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"fix" checkbox: The entered period is fixed and unchangeable. When either SOP or EOP change, they are automatically adjusted according to the fixed duration.
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"a" entry field: Enter the number of years the project period takes.
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"Month(s)" entry field: Enter the number of months the project period takes.
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"End (EOP)" combobox with arrow keys:
Enter the month and year in which the calculation ends.