IBM Cognos TM1 Developer's Certification Guide

Unmatched dimensionality

In the above example, the global (or consolidated) cube is made up of identical dimensionality, that is, each of the region cubes making the TM1 rule easy and straightforward. In practice, these cubes may not have matched dimensionality and you will need to add logic to your rules to resolve these differences. Additionally, even when cube dimensionality matches, specific elements may require translation between source and destination cubes.