SAP BW Multiprovider

The MultiProvider
does not represent physical tables, but is defined as a view on other InfoProviders
like InfoCubes, DataStore Objects, InfoObjects, …

It is also represented as a dimensional model,
and the InfoObjects inside this model are mapped to the physical InfoProviders.
It is a best practice to always build your queries on a MultiProvider, for
reasons of extensibility and re-usability.