An application date must be defined for each Rule.
This is the date as of which the rule is calculated (indispensable, for example, for a rule with a period of two weeks: it must be clear from which week the calculation begins).
The application date must correspond to the period's starting date:
A first schedule date must be globally defined for the Task. This corresponds to the date on which the Task is available for operations.
Depending on the scheduling parameters, the calculator will possibly reiterate its calculation until it finds a scheduling date greater than the first schedule date.