Unbalanced hierarchies include levels that are logically equivalent, but each branch of the hierarchy can descend to a different level. In other words, an unbalanced hierarchy contains leaf members at more that one level. The parent of every member comes from the level immediately above.
An example of an unbalanced hierarchy is the following organization chart, which shows reporting relationships between employees in an organization. The levels within the organizational structure are unbalanced, with some branches in the hierarchy having more levels than others.
IBM® Cognos® Dynamic Cubes inserts padding members to balance such hierarchies. For more information, see Padding members.