The main idea behind redefinition of a service is to create a new service by using an existing service. The Service Builder supports redefinition of the following services:
OData services created in SAP Gateway, see Redefining OData Service (SAP GW)
BW Query Service, see Redefining Services from External Framework (SPI, BW Query, GenI
SPI Service, see Redefining Services from External Framework (SPI, BW Query, GenI