sap legacy system migration workbench

IBM Global Services

SAP Legacy System Migration Workbench| 7.12.02

March-2005 © 2005 IBM Corporation

SAP Legacy System Migration Workbench

IBM Global Services

© 2005 IBM Corporation2 March-2005SAP Legacy System Migration Workbench| 7.12.02

Objectives

The participants will be able to: Describe the different data import technique of LSMW.

Create the source structures and fields to read input file data.

Map source structures with target structures using conversion rules.

Read and convert input file records into SAP.

Upload the legacy data into SAP using LSMW.

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Several data migration methods are there to transfer legacy data into SAP

Data Migration In SAP Projects

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Importance of data migration

What is data migration? Initial data transfer

Implement SAP R/3

Move data from legacy system to Sap R/3

Switch off legacy system

Periodic data transfer (interfacing) Exchange data between R/3 and other systems

Why is data migration important? Accounts for 15% - 20% of the total SAP R/3 implementation costs.

Smaller implementation projects: up to 40%

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Data migration

Why is data migration so expensive? In many cases

Need to develop conversion Programs

Need to deal with lots of technical details and different technologies

What does SAP offer now? LSMW (Legacy System Migration Workbench)

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What is LSMW?

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LSM Workbench

New tool from SAP to aid in data conversions.

Can be used for Direct Input, Batch Recordings, BAPIs, and IDOC in-bound processing.

Greatly reduces the amount of development time needed to create conversion programs.

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Key building blocks for LSMW conversion program

Project serves as an organizational unit used to combine Mapping and Field assignments

Sub Project is an organizational unit subordinated to the project. A project can have any number of subprojects assigned to it.

Object is assigned to a Sub project

Structure Relationships are Field mappings between the Source and the Target Structures within an Object

Field Assignments use Place Holders and Conversion Rules that define how the Field contents are to be converted

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An Example Scenario

Data migration in a company with several plants.

Total migration of data will be under a particular project.

Data migration for the individual plants within it can be classified as several sub projects under the said project.

An object assigned to a certain sub project can be for customer master upload or material master upload or FI documents upload etc.

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How LSM Workbench works

One or several files

R/3 S

tand

ard

Convert data

Batch Input processing

Legacy dataon PC

Legacy dataon PC

Read data

Converted data

Converted data

Data that has been

read

Data that has been

read Legacy data on application

server

Legacy data on application

server

IDoc inboundprocessing

Direct Input processing

Structure relations

Field assignments

Conversion rules

Structure relations

Field assignments

Conversion rules

SAP Application Server

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Steps to create new LSMW object

Launch the tool by running transaction LSMW from SAP.

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Execute each of the design steps sequentially

Main Design Steps

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Maintain Object Attributes

Configure basic attributes for the data upload

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Maintain Object Attributes (Contd.)

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Maintain Source Structures

Build Source Structure Hierarchy with all Fields of the Legacy System

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Maintain Source Fields

Create source fields in each of the source structures in the hierarchy

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Uploading Multiple Structures using a Single Data File

Insert Record Type Identifier (STYPE) as the First Field in each of the Source Structures

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Maintain Structure Relation

Create Relationships between the Source and the Target Structures

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Maintain Field Mapping and Conversion Rules

Assign Source/Legacy Fields of each structure to R/3 Fields. This can be done individually for each R/3 field of the Target Structure. For Time consuming and Complex Structures, we may use Automatic Field Mapping facility using option Extras -> Auto-Field Mapping

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Specify Conversion Rule

Use predefined conversion rules or create your own conversion rule in the ABAP editor.

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Create Global Data / Form Routines

Create Global Data Definitions and Subroutines, if needed, for Custom Conversion Rules – use the option Extras -> Display Variant for this purpose.

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Maintain Fixed Values, Translations, User Defined Routines

Create Re-usable Form Routines and use them in the Conversion rules during Field Mappings

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Reusable Translation is very useful for defining conversion rules for a field

Reusable Translation

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Specify Files

File containing Legacy Data can reside either in user PC or in the Application Server.

For Background Processing, the input file must be located on the Application server (Either Logical or Physical File). Use transaction FILE to create logical file.

File names for Read Data and Convert Data are defaulted by SAP and are respectively.

<Project>_<Subproject>_<Object>.lsmw.read and.

<Project>_<Subproject>_<Object>.lsmw.conv.

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File Properties

Input File Properties determine File Contents, Delimiter used, File Structure, File Type and Code page

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Assign Files

Map the Source Structures to the Data Files

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Execution of LSMW program

Execution Steps

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Uploading Legacy File Data

Use Read Data to execute the SAP generated Read Program /1CADMC/SAP_LSMW_READ_<8 digit identifier> to get the Legacy data from the Input File to an intermediate File (*.read).

Use Convert Data to execute SAP generated Conversion Program /1CADMC/SAP_LSMW_CONV_<8 digit identifier> to map the Data Read in the previous step to the Target R/3 fields using the Predefined Conversion Rules into another intermediate File (*.conv).

Execute the corresponding Batch Input or Direct Input program for uploading the Converted data into SAP.

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Customizing Design Steps

Design Steps can be customized using the option Extras -> Personal Menu

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LSMW Recoding

In LSMW recording can be used to upload legacy data into SAP

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Periodic Data Transfer

Periodic Data Transfer can be used if the Data Transfer Type specified under Object Attributes is ‘Periodic’.

Use SAP standard program /SAPDMC/SAP_LSMW_INTERFACE for Transferring Data Periodically.

The Input Data File for Periodic Data Transfer should reside on the Application Server.

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LSMW using IDOCs

Use option Settings -> IDOC Inbound Processing to configure File Port, Partner Type and Partner Number.

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What data can be transferred by LSM Workbench ?

SAP provides Standard Batch Input/ Direct Input Programs for a set of Objects

For any other uploads Batch Input Recordings can be created based on the required Transaction.

A set of Business Object Methods(BAPIs) are also provided by SAP for certain Objects .

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Examples of Master Data

Customer

Vendors

Bill of Materials

GL Accounts

Human Resource

Examples of Transaction Data

Condition Records

Sales Orders

Purchase Orders

Purchase Requisitions

Purchasing Info Records

Financial Documents

Good Movements

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Export/Import and Transporting LSMW Project

LSMW Projects can be downloaded to a file and that project can also be imported from the file.

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Limitations of LSM Workbench

Cannot be used to extract data from Legacy Systems

Cannot be used for outbound interfaces

Not 100% flexible

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Demonstration

Use of Legacy System Migration Workbench (LSMW) tool with an example.

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Practice

Use of Legacy System Migration Workbench (LSMW) tool with an example.

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Summary

LSMW can be used to migrate legacy data into SAP by Direct Input, Batch Recordings, BAPIs, and IDOC in-bound processing.

Basic steps of LSMW are selection of data import method, creation of source structure and fields, data mapping, file assignment, data read and conversion and finally data upload.

Custom ABAP code can be written in data mapping section to perform validation, data selection and to fulfill other customized requirements.

LSMW cannot be used for outbound interfaces.

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Questions

What are the key building blocks for a LSMW conversion program ?


What are the limitations of LSMW ?

sap legacy system migration workbench

Documents

key building blocks

ibm global services

predefined conversion rules

periodic data transfer

conversion rules

direct input

legacy data

2005 ibm corporation