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The Start Date, End Date, and Time Interval fields for which you wish to display license usage are interdependent, i.e. modifying the Start Date field affects the End Date field, depending on the selected Time Interval option. If you select the "Custom" option in the Time Interval options, then both fields (Start Date and End Date) can be modified; however, you will not be able to select the day earlier than the Start Date on the End Date field, and later than the End Date on the Start Date field, because the value on the other field will be automatically adjusted.