The document provides an overview of the LSMW (Legacy System Migration Workbench) tool in SAP. LSMW allows periodic or one-time transfer of data from legacy systems to SAP R/3. It supports various methods for data transfer, including batch input, BAPI, IDOC, and direct input. The document outlines the typical 14 processing steps used for batch input data transfer with LSMW, including maintaining object attributes, source structures and fields, field mapping, reading and converting data, and creating and running a batch input session. An example of using LSMW to update customer master records from an external file is also provided.

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T.code: LSMW
ENTER GIVE PROJECT NAME, SUBPROJECT NAME , OBJECT

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PRESS ENTER

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PRESS ENTER

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SELECT BATCH INPUT RECORDING RADIO BUTTON SELECT AND CLICK ON RECORDING OVERVIEW
BUTTON

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CLICK ON CREATE RECORDING BUTTON

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GIVE WORK CENTER LIKE AND ENTER
THE GIVEN BELOW STEPS RECORDING TRANSACTION T.CODE : CR01
DO NOT USE TAB BUTTON AND ENTER BUTTON USE ALWAYS MOUSE, WHILE RECORDING TIME .
GIVE RECORDING TRANSACTIONS : LIKE CRO1, CAO1, CSO1 for further Practice

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Save and back arrow (f3) two times

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Save and back arrow f3

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Click on table button

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Make like above another file

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Back

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Enter

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Save and back

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Save and back

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Like above all fields
Then save

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6 steps dummy

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Select legacy data area and click on add entry button (ctrl+f2)

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Then Save

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Save

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THEORY:
LSMW is a tool used to transfer data from legacy system to R/3 periodically or once .It
supports conversion of data and Batch Input, BAPI, IDOC or Direct Input can be used as
the method for transfer of data. Total of 26 processing steps are available in LSMW ,In case
of data transfer using Batch Input only 14 steps are required.
Execute the transaction LSMW to start transfer of data, Before using the LSMW we should
have good knowledge about the business object and the fields that will be transferred.
The main screen of LSMW provides wizard-like step-by-step tasks, To complete your
data conversion, you need to execute these steps in sequence. Once a step is executed,
the cursor is automatically positioned to the next step.
Note that these steps may look different depending upon your Personal menu settings. You
could make step numbers visible by ‘Numbers on’ icon or hidden by ‘Numbers off’ icon. You
can execute a step by double-clicking on the row. Toggle icon ‘Double click=Display’ or
‘Double click=Edit’, makes the step in ‘display’ mode or ‘change’ mode.
There are 14 steps that are normally used and these are.
1) Maintain Object Attributes.
2) Maintain Source Structures.
3) Maintain Source Fields.
4) Maintain Structure Relations
5) Maintain Field Mapping and conversion rules .
6) Maintain Fixed Values, translations ,user defined routines.
7) Specify Files .
8) Assign Files .
9) Read DATA.
10) Display Read Data.
11) Convert Data.
12) Display Converted Data.
13) Create Batch Input Session.
14) Run Batch Input Session.
1) Maintain Object Attributes.
In this example, you will be updating the customer master records with the help of
recording a transaction (XD02).
a. Choose radio button Batch Input Recording and
b. click on the recording overview icon to record the R/3 transaction.
c. Enter the Recording nameasXD02_REC,the description as Customer Master Updates

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Recording, and
the transaction code as XD02(FS00 in case of gl accounts)
Once the transaction is completed, R/3 records the flow of screens and fields and saves the
information,
2) Maintain Source Structures.
Give a name and a description to the source structure
3) Maintain Source Fields.
In this step, you need to list what fields are present in the source structure. The easiest
way is to click on ‘Table Maintenance’ icon to enter Fieldname, Type and Length for
each field
Note that your input file will have four fields as key fields and you need to update three
fields in the system
4) Maintain Structure Relations
Execute a step to ‘Maintain Structure Relations’. Since, there is only one Source and
Target Structure, the relationship is defaulted automatically
5) Maintain Field Mapping and conversion rules .
In this step, source/legacy fields in each structure are assigned to R/3 fields. It may be
done individually for each R/3 field, which being time-consuming for complex structures or
we can use automatic mapping utility (Extras > Auto-Field mapping).
We can specify the conversion rule to be used to convert an LS field into the corresponding
R/3 field. For this, use predefined conversion rules or create your own conversion rules in
the editor.
You may use the buttons ‘Initial’, ‘Constant’, ‘Move’ & ‘Fixed Value’ to assign different
values. You may also assign different rules by using the button ‘Rule’. automatic mapping
utility (Extras > Auto-Field mapping).
6) Maintain Fixed Values, translations ,user defined routines.
7) Specify Files .
In this step, we define how the layout of the input file is. The input file is a [Tab] delimited
with the first row as field names. It is present on my PC (local drive)
Create an Excel file with your data and save it as a Tab-delimited text file on your local
drive.
8) Assign Files .
Execute step ‘Assign Files’ and the system automatically defaults the filename to the
source structure.

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9) Read DATA.
In this step, LSMW reads the data from the source file (from your PC’s local drive).
10) Display Read Data.
This step is optional. If required, you can review the field contents for the rows of data read
11) Convert Data.
This is the step that actually converts the source data (in source format) to a target
format. Based on the conversion rules defined, source fields are mapped to target
fields.
12) Display Converted Data.
Again this is an optional step to view how the source data is converted to internal SAP
format
13) Create Batch Input Session.
Once the source data is converted in an internal format, you can create a batch session to
process updates .
14) Run Batch Input Session.
You can execute the BDC session by Run Batch input session. Executing a batch input
session is a standard SM35 transaction for managing BDC sessions. Once you have
successfully executed the batch input session, the customer master records are updated in
the system. You can confirm this by viewing the customer master records (XD03).
Note! Browsing thru these 14 steps, you may get a feeling that this is a very lengthy and
time-consuming activity. However, for the purposes of demonstration, I have made it
detailed. Although it looks lengthy, actually it takes hardly few hours from start-to-finish!
After playing around with few simple LSMW scripts, you will find it so easy to change and
create more complex ones.