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ALE is SAP proprietary technology that enables data communications between two or more SAP R/3 systems and/or R/3 and external systems. There are three layers in ALE system: application services, distribution services, and communication services.
For communication services, ALE performs a Remote Function Call (RFC) using the port definition and RFC destination specified by the customer model. RFC is used to communicate between applications of different systems in the SAP environment includes connections between SAP systems as well as between SAP systems and non-SAP systems. Remote Function Call (RFC) is the standard SAP interface for communication between SAP systems. The RFC calls a function to be executed in a remote system.
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Means of creating and operating distributed applications.
The purpose of Application Line Enabling is to guarantee a distributed, but integrated, R/3 installation. This involves business-controlled message exchange with consistent data across loosely linked SAP applications.
Application integration is achieved not via a central database, but via synchronous and asynchronous communication.
Application Link Enabling comprises the following three layers:
application services
distribution services
communication services
Two Development Models
Distribution using BAPIs
Distribution using Message 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:
Outbound Processing
Inbound Processing
You can find information on other ALE functions under:
Master Data Distribution
Communicating with Non-R/3 Systems
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1. The Remote Function Call facility allows you to call an R/3 Function module on a “remote” machine.
2. To communicate between two R/3 Systems and also with an External System. External Application program also can call these function module for integration.
3. RFC or sRFC - Synchronous RFC
aRFC - Asynchronous RFC
tRFC - Transactional RFC
qRFC - Queued RFC (I.e. Serialization of tRFC)
Types of RFC Call
Synchronous
CALL FUNCTION Func Destination Dest
CALL FUNCTION func DESTINATION 'NONE' ...
CALL FUNCTION func DESTINATION ’BACK' ...
Asynchronous
CALL FUNCTION func … STARTING NEW TASK taskname
PERFORMING form ON END OF TASK
RECEIVE RESULTS FROM FUNCTION func
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Thanks
sivaparvathi
Bluesky
