1. A computer-implemented system centrally managing core enterprise reference data of an enterprise, comprising: a centralized master repository comprising the core enterprise reference data describing structure and characteristics of the enterprise and one or more entities associated with the enterprise; an internal services framework tangibly embodied on a non-transitory computer-readable storage media and coupled with the centralized master repository, the internal services framework providing internal services that manage the core enterprise reference data within the centralized master repository; and an infrastructure services layer tangibly embodied on a non-transitory computer-readable storage media and coupled with the centralized master repository, the infrastructure services layer providing synchronization of inbound and outbound staging areas through an inbound data staging area and an outbound data staging area, the infrastructure services layer comprising a physical data layer that comprises a database associated with the centralized master repository that stores the core enterprise reference data, a front side data services layer that is mapped to an appropriate object-based layer and provides direct data access to the internal services that directly access the core enterprise reference data within the database, and a back side data services layer that provides indirect access to external operation services associated with external operation systems that indirectly access the core enterprise reference data within the database, the backside data services layer and associated mappings remaining fixed over time.