When using custom dimensions, you must follow the naming conventions in Naming Restrictions for Dimensions, Members, and Aliases. Ensure that dimension names and aliases are unique. They can contain up to 80 characters, including spaces. Descriptions have up to 255 characters.
You can assign access permissions to members, rearrange the dimension member hierarchy, and share members of the Entity, Account, and custom dimensions. For information about assigning access permissions, see the Oracle Hyperion Planning Administrator's Guide.