BAPI Programming Guide (CA-BFA)
This BAPI Programming Guide describes the development process when developing new BAPIs. These guidelines also apply to enhancing and modifying existing BAPIs.
The following links lead to more detailed information and guidelines in the area of BAPI development:
General Introduction to BAPIs
Customer Enhancement and Modification of BAPIs
SAP Enhancements to Released BAPIs
BAPIs for Mass Data Transfer
Using the ALE Services