A period when the calculation type is in effect. The period is calculated by the platform according to "displacement by action period" rule. In general, it can be a composition of several periods.
For example, if an employee takes a vacation on the second week of the month, the vacation payment displaces the salary payment on the second week. Therefore, the actual action period for salary payment is a composition of two periods: the first week and the remainder of the month starting from the third week.