Business functions and processes are distributed using message types. A message type represents a business function. The technical structure of the message type is the IDoc type.
The programming model "Distribution using message types" contains the definitions of message types and IDoc types and the ABAP code for processing inbound and outbound IDocs.
Defining message types and IDoc types:
If you want to create message type enhancements for master data distribution, you also have to create a new message type for each enhancement.
The ALE interface does not allow you to create different segment data for different IDoc types for the same message type.
Writing ABAP code:
For information about other ALE functions, see:
Communicating with Non-SAP Systems
For information on IDoc interfaces to non-SAP systems refer to the documentation Interfaces to the Warehouse Management System.