Connections to Non-SAP Systems
ALE is not restricted to communication between SAP systems, it can also be used for connecting R/3 Systems to non-SAP systems.
By using IDocs as universal information containers, ALE can reduce the number of different application interfaces to one single interface that can either send IDocs from an R/3 System or receive IDocs in an R/3 System.
SAP certified
Translator Programs can convert IDoc structures into customer-defined structures.Alternatively, the RFC interface for sending and receiving IDocs can be used in non-SAP systems.
In both cases you need the RFC Library of the RFC Software Development Kit (RFC-SDK).
Communication from an R/3 System to a Non-SAP System

Communication from a Non-SAP System to an R/3 System

You can find an example of an IDoc interface to non-R/3 Systems in the documentation
Interfaces to Link Mobile Data Entry and Warehouse Control Unit.
