Please send detail steps for uploading legacy data

Question

Hi friends,
please send detail steps for uploading legacy data
Thanking u in advance,
Diwa.

Answer 1

HI U CAN USE LSMW TO UPLOAD LEGACY DATA
LSMW is used for migrating data from a legacy system to SAP system, or from one SAP system to another.
Apart from standard batch/direct input and recordings, BAPI and IDocs are available as additional import methods for processing the legacy data.
The LSMW comprises the following main steps:
Read data (legacy data in spreadsheet tables and/or sequential files).
Convert data (from the source into the target format).
Import data (to the database used by the R/3 application.
But, before these steps, you need to perform following steps :
Define source structure : structure of data in the source file.
Define target structure : structure of SAP that receives data.
Field mapping: Mapping between the source and target structure with conversions, if any.
Specify file: location of the source file
Of all the methods used for data migration like BDC, LSMW , Call Transaction which one is used most of the time?
How is the decision made which method should be followed? What is the procedure followed for this analysis?
All the 3 methods are used to migrate data. Selection of these methods depends on the scenario, amount of data need to transfer. LSMW is a ready  tool provided by SAP and you have to follow some 17 steps to migrate master data. While in BDCs Session method is the better choice because of some advantages over call transaction. But call transaction is also very useful to do immediate updation of small amout of data. (In call transaction developer has to handle errors).
SO Bottom line is make choice of these methods based of real time requirements.
These methods are chosen completely based on situation you are in. Direct input method is not available for all scenario, else, they are the simplest ones. In batch input method ,you need to do recording for the transaction concerned. Similarly, IDoc, and BAPI are there, and use of these need to be decided based on the requirement.
Try to go through the some material on these four methods, and implement them.  You will then have a fair idea about when to use which.
LSMW Steps For Data Migration
How to develop a lsmw for data migration for va01 or xk01 transaction?
You can create lsmw for data migration as follows (using session method):
Example for xk01 (create vendor)
Initially there will be 20 steps but after processing 1 step it will reduced to 14 for session method.
1. TCode : LSMW.
2. Enter Project name, sub project name and object name.
    Execute.
3. Maintain object attributes.
    Execute
    select Batch Input recording
    goto->Recording overview
    create
    recording name.
    enter transaction code.
    start recording
    do recording as per ur choice.
    save + back.
    enter recording name in lsmw screen.
    save + back
Now there will be 14 steps.
2. MAINTAIN SOURCE STRUCTURES.
    Here you have  to enter the name of internal table.
    display change
    create
    save + back
3. MAINTAIN SOURCE FIELDS.
    display change
    select structure
    source_fields->copy fields.
    a dialogue window will come .
    select -> from data file
    apply source fields
    enter No. of fields
    length of fields
    attach file
    save + back
4. MAINTAIN STRUCTURE RELATIONS
    display change
    save + back
5. MAINTAN FIELD MAPPING & CONVERSION RULE
    display change
    click on source field, select exact field from structue and enter
    repeat these steps for all fields.
    save+back
6. MAINTAIN FIXED VALUES, TRANSACTION, USER DEFINED
    execute
    save + back
7. SPECIFY FILES.
    display change
    click on legacy data
    attah flat file
    give description
    select tabulatore
    enter
    save + back
8. ASSIGN FILE
    execute
    display  change
    save + back
9. IMPORT DATA.
    execute
    display  change
    save + back
10. DISPLAY IMPORTED DATA
      enter ok, it willl show records only.
      back
11. CONVERT DATA
      execute
      display  change
      save + back
12. DISPLAY CONVERTED DATA
      execute
      display  change
      save + back
13. CREATE BATCH INPUT SESSION
      tick keep batch input folder
      F8
      back
14. RUN BATCH INPUT SESSION.
      sm35 will come
      Object name will be shown here
      select object & process