In an SAP R/3 implementation the data from legacy system (non SAP R/3) needs to be transferred to the SAP system. Periodic data transfer between R/3 and other system (interfacing) is also required. Both of the above form a part of data migration. In SAP, known tools for data migration are:
BDC (Batch Data Communication)
LSMW (Legacy System Migration Workbench)
This document presents high level view of LSMW and to provides you information about how to use this functionality. Following are the headlines from this study material:
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Starting with the definition of R/3 Architecture Components, this document brings you to a complete overview of the almost all ABAP Basics. During the reading you will learn the common statements used in creation of ABAP Screens with given examples and then you will be introduced to Data Dictionary objects. The ongoing topics covered in this document are as follows:
BDC is used to transfer data from SAP to SAP system or from a non-SAP system to SAP system.It uses the normal Transaction codes to transfer the data. This method is used to transfer large amount data that is available in electronic form. There are two types of methods offered by SAP for BDC:
First method is called the “Classical Method”. In this method, the data that is read by the BDC program from a sequential dataset file is stored in a batch-input session. To run the transactions in the session, you need to execute the session. This method uses the function module BDC_OPEN, BDC_INSERT and BDC_CLOSE to generate the sessions
In the second method, BDC uses the ABAP statement CALL TRANSACTION USING statement to run a transaction. In this method, BDC does not create a session. Read more →
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When a company decides to implement the SAP R/3 to manage business critical data, it usually does not start from a no-data situation. Normally, a SAP R/3 project comes into replace or complement existing application. In the process of replacing current applications and transferring application data, two situations might occur:
The first is when application data to be replaced is transferred at once, and only once.
The second situation is to transfer data periodically from external systems to SAP and vice versa.
There is a period of time when information has to be transferred from existing application, to SAP R/3, and often this process will be repetitive.
The early versions of R/3, SAP has been providing batch interfacing techniques. Among these techniques, Batch Data Communication (BDC) is the oldest one. BDC is not bi-directional; it is an integration tool in its typical form. It can only be used for uploading data into RJ3. BDC works through an ABAP program and works on the principle of simulating user input for transactional screen.
The purpose of the Batch Data Communication is to transfer data. The BDC can transfer data from one SAP System to another SAP System or can transfer data from non-SAP System to SAP System too. To transfer data BDC uses normal transaction codes. Two methods are provided to BDC to do this work. Read more →
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Get the basics and most important aspects of ABAP with this presentation package.Contents covered;
Introduction to ABAP
Data Types in ABAP
Internal Tables
Statements in ABAP
Open SQL
SAP Authorizations
Subroutines in ABAP Programming
Events in ABAP Programming
User Dialogs-List Programming
User Dialogs- ALV Programming
User Dialogs- Dialog Programming
REUSE Components-Fn Grps and Fn. Modules
REUSE Components-BAPIs
DB Lock Concept in SAP
User Exits
SAP BDC Recording
ALE
SMARTFORMS
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