Period of time
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In the maintenance task data a time interval in days can be entered. Additionally a pre-warning time can be defined meaning: so many days before the end of the time interval the maintenance task should be evaluated as a 'current' maintenance task. (message 'Maintenance due in xx days'.)
If the period of time or the counter value of the maintenance interval is reached, the maintenance is entered with the text 'Maintenance interval exceeded'.
The date of the last maintenance is updated for each execution. On creating the maintenance task this date is set to the current date.