SAP NetWeaver user interface services offers a set of back-end services and front-end services.
To decouple your UI, you use OData services for ABAP-based back-end systems based on an
OData channel that is part of SAP Gateway. To couple to a new UI technology,
you use front-end services.
APIs are available on three different layers:
- JavaScript services provide integration capabilities and simplify access to
data from back-end systems.
- OData services are consumed by the front-end services and allow you to
retrieve data from back-end systems using SAP Gateway.
- ABAP APIs are consumed by the OData services mentioned above. You can use
these APIs to create your own services for maximum flexibility.