This document explains how to enhance data sources using the BAdI RSU5_SAPI_BADI instead of user exits. It describes implementing the BAdI, creating a template method, and providing examples of populating enhanced fields for a specific data source. Implementing the BAdI involves creating a class with methods to handle each data source enhancement. The template method serves as an example for populating fields, while actual methods would call data selection and populate fields for a specific source.