Returns TRUE if the current member is the specified member or an ancestor of the specified member. This function includes the specified member.
Any valid single member name or member combination, or a function that returns a single member or member combination.
In the Sample Basic database:
Returns TRUE for Market, West, and California. California is the specified member, and West and Market are ancestors of California.
Returns FALSE for Jan, Feb, Mar, Qtr2. None of these members is the specified member (Qtr1) or an ancestor of Qtr1.