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Returns the first sibling among the descendants of a specified level, optionally at a specified member.


OpeningPeriod([«Level»[, «Member»]])


The dimension that contains «Level» is used if «Level» is specified; otherwise, the Time dimension is used. If no «Level» is specified, the level below that of «Member» is used. If no «Level» or «Member» is specified, the default is Time.CurrentMember.

This function is equivalent to TopCount(Descendants(«Member», «Level»), 1).

The ClosingPeriod function is similar, except that it returns the last sibling instead of the first sibling.


The following example returns [1991].January:

OpeningPeriod(Month, [1991])