Presentation Layer contains Presentation Catalogs which are called as Subject areas in Answers. Each catalog would be having its own set of tables which are imported from BMM layer. Catalogs are created based on the business requirements each having its own set of tables and security implementations. Normally columns from two tables from two different subject areas cannot be used in the query/request.
A new catalog can be created by RC in the presentation layer and importing associated tables from BMM layer. It is necessary to have atleast one fact table in every catalog. The tables and columns present in the catalog are only visible in Answers for creating reports/requests.
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