A linked universe is a .unx universe that contains a link to a designated core universe in the Business Objects (BI) Platform Repository. It inherits the core universe's data foundation and business layer as read-only resources. You can create views and objects from components of the core universe, as well as add new tables and objects that are independent of the core universe. When changes are made in the core universe, they are automatically propagated to the shared components in its linked universes.
A linked universe can reference one or more core universes, so it can use components in the core data foundation and business layer of each universe.
The linking process makes it appear as though the data foundation and business layer of universe A are part of universe B. However, they are just a look-up (signified by graying them out in universe B) to universe A and cannot be edited in universe B.
You have the following advantages when linking universes:
Reduce development and maintenance time: When you modify a component in the core universe, the changes are made to the same component in all of its linked universes when each universe is refreshed.
Centralization of components: Frequently used components can be centralized in a core universe and then included in all linked universes. You do not have to recreate components each time you create a new universe.
Facilitate specialization of universe design: Universe development can be split between developers who create core universes, and specialized designers who create more functional business layers based on their specific field.