The creation of data models is an integral part of the development process for SAP Gateway. You can create, edit, and display the data models on which you base an OData service for SAP Gateway either in the Service Builder (transaction SEGW) or in the ABAP Workbench (transaction SE80). The Service Builder not only enables you to define data models, but rather create and maintain complete OData services for SAP Gateway.
The Service Builder is a dedicated design-time transaction, which provides a toolset for creating services easily and efficiently and it supports the entire service development lifecycle. The Service Builder succinctly blends new and existing ABAP development tools in an OData-compliant modeling transaction.
The Service Builder supports the following development phases for OData services:
Data Model Definition