The Business Model and Mapping layer defines the business, or logical, model of the data and specifies the mapping between the business model and the Physical layer schemas. This layer can contain one or more business models.
The Business Model and Mapping layer determines the analytic behavior that is seen by users and defines the set of objects available to them.
Logical tables exist in the Business Model and Mapping layer. The logical schema defined in each business model must contain at least two logical tables, and you must define the relationships between them. Each logical table has logical columns and associated logical table sources.
See the Oracle® Fusion Middleware Metadata Repository Builder's Guide for Oracle Business Intelligence Enterprise Edition.