|Level||Hierarchy level to compare date from prior periods.|
|Numeric_Expression||Integer number. Difference between current and prior period|
ParallelPeriods returns the member in same relative position as the specified member that can be used to find some measure value for a prior period.
For example, if year 2018 is selected in report
will return a member:
The following formula can be used to calculate a created issues in the same period (as selected) one year ago.