How to upload the data from legacy system database to SAP data base

Hi.
We are doing analysis of Legacy system and which needs to be converted to SAP system i.e. SAP implementation.
I just want to know , how we migrate the existing whole data( from legacy system) into SAP system.
and which method is the best method to use data migration from legacy to SAP system if data legacy data amount is huge.
Please suggest me.
Thanks.

Hi
We can either use the BDC or BAPI or LSMW  or Direct Input techiniques for the data transfers.
The combination of both Session and Call transaction can be used to achieve this that includes the error handling also. This invloves the screen interaction.
These days, BAPIs are used to overvome some upgrade problems. For easy upgradation, we cna go for BAPIs. Here ther is no screen intercation.
LSMW mainly used for master data transfers using some standrad programs.
As per your client or company desicions  we can choose any of them.
Please refer to these links for more understanding -
BDC Vs LSMW -
BDC VS LSMW
BDC Vs BAPI -
BDC VS LSMW
Thanks & Regards,
Chandralekha.

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    The Legacy System Migration Workbench (LSMW) is a tool recommended by SAP that you can use to transfer data once only or periodically from legacy systems into an R/3 System.
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    Messages into <MSGTAB>.
    Parameter – 1 is transaction code.
    Parameter – 2 is name of BDCTAB table.
    Parameter – 3 here you are specifying mode in which you execute transaction
    A is all screen mode. All the screen of transaction are displayed.
    N is no screen mode. No screen is displayed when you execute the transaction.
    E is error screen. Only those screens are displayed wherein you have error record.
    Parameter – 4 here you are specifying update type by which database table is updated.
    S is for Synchronous update in which if you change data of one table then all the related Tables gets updated. And sy-subrc is returned i.e., sy-subrc is returned for once and all.
    A is for Asynchronous update. When you change data of one table, the sy-subrc is returned. And then updating of other affected tables takes place. So if system fails to update other tables, still sy-subrc returned is 0 (i.e., when first table gets updated).
    Parameter – 5 when you update database table, operation is either successful or unsuccessful or operation is successful with some warning. These messages are stored in internal table, which you specify along with MESSAGE statement. This internal table should be declared like BDCMSGCOLL, a structure available in ABAP/4. It contains the following fields:
    1. Tcode: Transaction code
    2. Dyname: Batch point module name
    3. Dynumb: Batch input Dyn number
    4. Msgtyp: Batch input message type (A/E/W/I/S)
    5. Msgspra: Batch input Lang, id of message
    6. Msgid: Message id
    7. MsgvN: Message variables (N = 1 - 4)
    For each entry, which is updated in database, table message is available in BDCMSGCOLL. As BDCMSGCOLL is structure, you need to declare a internal table which can contain multiple records (unlike structure).
    Steps for CALL TRANSACTION method
    1. Internal table for the data (structure similar to your local file)
    2. BDCTAB like BDCDATA
    3. UPLOAD or WS_UPLOAD function to upload the data from local file to itab. (Considering file is local file)
    4. Loop at itab.
    Populate BDCTAB table.
    Call transaction <tcode> using <BDCTAB>
    Mode <A/N/E>
    Update <S/A>.
    Refresh BDCTAB.
    Endloop.
    (To populate BDCTAB, You need to transfer each and every field)
    The major differences between Session method and Call transaction are as follows:
    SESSION METHOD CALL TRANSACTION
    1. Data is not updated in database table unless Session is processed. Immediate updation in database table.
    2. No sy-subrc is returned. Sy-subrc is returned.
    3. Error log is created for error records. Errors need to be handled explicitly
    4. Updation in database table is always synchronous Updation in database table can be synchronous Or Asynchronous.
    Error Handling in CALL TRANSACTION
    When Session Method updates the records in database table, error records are stored in the log file. In Call transaction there is no such log file available and error record is lost unless handled. Usually you need to give report of all the error records i.e., records which are not inserted or updated in the database table. This can be done by the following method:
    Steps for the error handling in CALL TRANSACTION
    1. Internal table for the data (structure similar to your local file)
    2. BDCTAB like BDCDATA
    3. Internal table BDCMSG like BDCMSGCOLL
    4. Internal table similar to Ist internal table
    (Third and fourth steps are for error handling)
    5. UPLOAD or WS_UPLOAD function to upload the data from the local file to itab. (Considering file is local file)
    6. Loop at itab.
    Populate BDCTAB table.
    Call transaction <tr.code> using <Bdctab>
    Mode <A/N/E>
    Update <S/A>
    Messages <BDCMSG>.
    Perform check.
    Refresh BDCTAB.
    Endloop.
    7 Form check.
    IF sy-subrc 0. (Call transaction returns the sy-subrc if updating is not successful).
    Call function Format_message.
    (This function is called to store the message given by system and to display it along with record)
    Append itab2.
    Display the record and message.
    DIRECT INPUT
    About Direct Input
    In contrast to batch input, this technique does not create sessions, but stores the data directly. It does not simulate the online transaction. To enter the data into the corresponding database tables directly, the system calls a number of function modules that execute any necessary checks. In case of errors, the direct input technique provides a restart mechanism. However, to be able to activate the restart mechanism, direct input programs must be executed in the background only. Direct input checks the data thoroughly and then updates the database directly.
    You can start a Direct Input program in two ways;
    Start the program directly
    This is the quickest way to see if the program works with your flat file. This option is possible with all direct input programs. If the program ends abnormally, you will not have any logs telling you what has or has not been posted. To minimize the chance of this happening, always use the check file option for the first run with your flat file. This allows you to detect format errors before transfer.
    Starting the program via the DI administration transaction
    This transaction restarts the processing, if the data transfer program aborts. Since DI document are immediately posted into the SAP D/B, the restart option prevents the duplicate document posting that occurs during a program restart (i.e., without adjusting your flat file).
    Direct input is usually done for standard data like material master, FI accounting document, SD sales order and Classification for which SAP has provided standard programs.
    First time you work with the Direct Input administration program, you will need to do some preparation before you can transfer data:
    - Create variant
    Define job
    Start job
    Restart job
    Common batch input errors
    - The batch input BDCDATA structure tries to assign values to fields which do not exist in the current transaction screen.
    The screen in the BDCDATA structure does not match the right sequence, or an intermediate screen is missing.
    On exceptional occasions, the logic flow of batch input session does not exactly match that of manual online processing. Testing the sessions online can discover by this.
    The BDCDATA structure contains fields, which are longer than the actual definition.
    Authorization problems.
    RECORDING A BATCH INPUT
    A B recording allows you to record a R/3 transaction and generate a program that contains all screens and field information in the required BDC-DATA format.
    You can either use SHDB transaction for recording or
    EDIT&#61614; BATCH INPUT &#61614; SERVICES &#61614;SYSTEM
    And from here click recording.
    Enter name for the recording.
    (Dates are optional)
    Click recording.
    Enter transaction code.
    Enter.
    Click Save button.
    You finally come to a screen where, you have all the information for each screen including BDC_OKCODE.
    • Click Get Transaction.
    • Return to BI.
    • Click overview.
    • Position the cursor on the just recorded entry and click generate program.
    • Enter program name.
    • Click enter
    The program is generated for the particular transaction.
    BACKGROUND PROCESSING
    Need for Background processing
    When a large volume of data is involved, usually all batch inputs are done in background.
    The R/3 system includes functions that allow users to work non-interactively or offline. The background processing systems handle these functions.
    Non-interactively means that instead of executing the ABAP/4 programs and waiting for an answer, user can submit those programs for execution at a more convenient planned time.
    There are several reasons to submit programs for background execution.
    • The maximum time allowed for online execution should not exceed 300 seconds. User gets TIMEOUT error and an aborted transaction, if time for execution exceeds 300 seconds. To avoid these types of error, you can submit jobs for background processing.
    • You can use the system while your program is executing.
    This does not mean that interactive or online work is not useful. Both type of processing have their own purposes. Online work is the most common one entering business data, displaying information, printing small reports, managing the system and so on. Background jobs are mainly used for the following tasks; to process large amount of data, to execute periodic jobs without human intervention, to run program at a more convenient, planned time other than during normal working hours i.e., Nights or weekends.
    The transaction for background processing is SM36.
    Or
    Define jobs&#61614; Jobs &#61614; Administration &#61614;Tools
    Or
    &#61614;System Jobs&#61614;services
    Components of the background jobs
    A job in Background processing is a series of steps that can be scheduled and step is a program for background processing.
    • Job name. Define the name of assigned to the job. It identifies the job. You can specify up to 32 characters for the name.
    • Job class. Indicates the type of background processing priority assigned to the job.
    The job class determines the priority of a job. The background system admits three types of job classes: A B & C, which correspond to job priority.
    • Job steps. Parameters to be passed for this screen are as follows:
    Program name.
    Variant if it is report program
    Start criteria for the job: Option available for this are as follows:
    Immediate - allows you to start a job immediately.
    Date/Time - allows you to start a job at a specific name.
    After job - you can start a job after a particular job.
    After event - allows you to start a job after a particular event.
    At operation mode - allows you to start a job when the system switches to a particular operation mode.
    Defining Background jobs
    It is two step process: Firstly, you define the job and then release it.
    When users define a job and save it, they are actually scheduling the report i.e., specifying the job components, the steps, the start time.
    When users schedule program for background processing, they are instructing the system to execute an ABAP/4 report or an external program in the background. Scheduled jobs are not executed until they are released. When jobs are released, they are sent for execution to the background processing system at the specified start time. Both scheduling and releasing of jobs require authorizations.
    HANDLING OF POP UP SCREEN IN BDC
    Many times in transaction pop up screen appears and for this screen you don’t pass any record but some indication to system telling it to proceed further. For example: The following screen
    To handle such screen, system has provided a variable called BDC_CURSOR. You pass this variable to BDCDATA and process the screen.
    Usually such screen appears in many transactions, in this case you are just passing information, that YES you want to save the information, that means YES should be clicked. So you are transferring this information to BDCDATA i.e., field name of YES which is usually SPOT_OPTION. Instead of BDC_OKCODE, you are passing BDC_CURSOR.
    BDC_CURSOR is also used to place cursor on particular field.
    AN EXAMPLE WITH SESSION METHOD
    Following program demonstrates how data is passed from flat file to SAP transaction and further to database table by using SESSION method.
    The transaction is TFBA (to change customer).
    A simple transaction where you are entering customer number on first screen and on next screen data is displayed for the particular customer number. Field, which we are changing here, are name and city. When you click on save, the changed record gets saved.
    Prerequisite to write this BDC interface as indicated earlier is:
    1. To find screen number
    2. To find screen field names, type of the field and length of the field.
    3. To find BDC_OKCODE for each screen
    4. Create flat file.
    Flat file can be created in your hard disk as follows:
    1 Vinod Krishna Hyderabad
    2 Kavitha Secunderabad
    3 Kishore Hyderabad
    (Where 1st character field is Customer number, 2nd field is Customer name and 3rd field is City.)
    To transfer this data to database table SCUSTOM following interface can be used.
    REPORT DEMO1.
    Following internal table is to upload flat file.
    DATA: BEGIN OF ITAB OCCURS 0,
    ID(10),
    NAME(25),
    CITY(25),
    END OF ITAB.
    *Following internal table BDCDATA is to pass date from internal table to session.
    DATA: BDCTAB LIKE BDCDATA OCCURS 0 WITH HEADER LINE.
    Variables
    DATA: DATE1 LIKE SY-DATUM. DATE1 = SY-DATUM - 1. “ This is for Hold Date
    To upload flat file to internal table.
    CALL FUNCTION UPLOAD
    EXPORTING
    FILE NAME = ‘C:FF.TXT’
    FILE TYPE = ‘ASC”
    TABLES
    DATA_TAB = ITAB
    EXCEPTIONS
    CONVERSION_ERROR = 1
    INVALID_TABLE_WIDTH = 2
    INVALID_TYPE = 3
    NO_BATCH = 4
    UNKNOWN_ERROR = 5
    OTHERS = 6.
    If sy-subrc = 0.
    Calling Function to Create a Session
    CALL FUNCTION ‘BDC_OPEN_GROUP’
    EXPORTING
    CLIENT = SY-MANDT
    GROUP = ‘POTHURI’
    HOLDDATE = DATE1
    KEEP = ‘X’
    USER = SY-UNAME
    EXCEPTIONS
    CLIENT_INVALID = 1
    DESTINATION_INVALID = 2
    GROUP_INVALID = 3
    GROUP_IS_LOCKED = 4
    HOLDDATE_INVALID = 5
    INTERNAL_ERROR = 6
    QUEUE_ERROR = 7
    RUNNING = 8
    SYSTEM_LOCK_ERROR = 9
    USER_INVALID = 10
    OTHERS = 11.
    If sy-subrc = 0.
    *-- MAIN Logic--
    LOOP AT ITAB
    PERFORM GENERATE_DATA. “ Populating BDCDATA Table
    CALL FUNCTION ‘BDC_INSERT’
    EXPORTING
    TCODE = ‘TFBA’
    TABLES
    DYNPROTAB = BDCTAB
    EXCEPTIONS
    INTERNAL_ERROR = 1
    NOT_OPEN = 2
    QUEUE_ERROR = 3
    TCODE_INVALID = 4
    PRINTING_INVALID = 5
    POSTING_INVALID = 6
    OTHERS = 7.
    REFRESH BDCTAB
    ENDLOOP.
    Calling function to close the session
    CALL FUNCTION ‘BDC_CLOSE_GROUP’
    EXCEPTIONS
    NOT_OPEN = 1
    QUEUE_ERROR = 2
    OTHERS = 3.
    Endif.
    Endif.
    *& Form GENERATE_DATA
    Create BDC Data
    FORM GENERATE_DATA
    Passing information for 1st screen on BDCDATA
    BDCTAB-PROGRAM = ‘SAPMTFBA’.
    BDCTAX-DYNPRO = 100.
    BDCTAP-DYNBEGIN = ‘X’.
    APPEND BCDTAB.CLEAR BDCTAB.
    Passing field information to BDCDATA
    BDCTAB-FNAM = ‘SCUSTOM-ID’
    BDCTAB-FVAL = ITAB-ID.
    APPEND BDCTAB.CLEAR BDCTAB.
    Passing BDC_OKCODE to BDCDATA
    BDCTAB-FNAM = ‘BDC_OKCODE’.
    BDCTAB-FVAL = ‘/5’.
    APPEND BDCTAB.CLEAR BDCTAB.
    Passing screen information for next screen to BDCDATA
    BDCTAB-PROGRAM = ‘SAPMTFBA’.
    BDCTAB-DYNPRO = 200.
    BDCTAB-DYNBEGIN = ‘X’.
    APPEND BDCTAB.CLEAR BDCTAB.
    Passing screen information to BDCDATA
    BDCTAB-FNAM = ‘SCUSTOM-NAME’.
    BDCTAB-FVAL = ITAB-NAME.
    APPEND BDCTAB.CLEAR BDCTAB.
    Passing screen information to BDCDATA
    BDCTAB-FNAM = ‘SCUSTOM-CITY’.
    BDCTAB-FVAL = ITAB-CITY.
    APPEND BDCTAB.CLEAR BDCTAB.
    Passing BDC_OKCODE to BDCDATA
    BDCTAB-FNAM = ‘BDC_OKCODE’.
    BDCTAB-FVAL = ‘SAVE’.
    APPEND BDCTAB.CLEAR BDCTAB.
    ENDFORM. “GENERATE_DATA
    AN EXAMPLE WITH CALL TRANSACTION
    Same steps to be repeated for CALL TRANSACTION
    The only difference between the two types of interface is in Session method, you create session and store information about screen and data into session. When session is processed the data is transferred to database. While in CALL TRANSACTION, data is transferred directly to database table.
    REPORT DEMO1.
    Follow above Code till MAIN Logic. Even the Subroutine should be copied
    LOOP AT ITAB
    PERFORM GENERATE_DATA, “Populating BDCDATA Table
    Call transaction ‘TFBA’ using BCDDATA Mode ‘A’ Update ‘S’.
    REFRESH BDCTAB
    ENDLOOP.
    check this link:
    http://www.sap-img.com/abap/learning-bdc-programming.htm
    http://www.sap-img.com/bdc.htm
    www.sappoint.com/abap/bdcconcept.pdf
    www.sap-img.com/abap/learning-bdc-programming.htm
    www.sap-img.com/abap/question-about-bdc-program.htm
    www.sapdevelopment.co.uk/bdc/bdchome.htm
    www.planetsap.com/bdc_main_page.htm
    Re: bdc mm01
    http://www.sapbrain.com/TUTORIALS/TECHNICAL/BDC_tutorial.html
    http://www.sap-img.com/abap/bdc-example-using-table-control-in-bdc.htm
    http://help.sap.com/saphelp_erp2005/helpdata/en/fa/097119543b11d1898e0000e8322d00/frameset.htm
    http://myweb.dal.ca/hchinni/sap/bdc_home.htm
    IDOC
    What is IDOC ?
    IDoc
    Standard SAP format for electronic data interchange between systems (Intermediate Document). Different message types (such as delivery confirmations or purchase orders) normally represent different specific formats, the IDoc types. However, multiple message types with related content can be assigned to one IDoc type: For example, the IDoc type ORDERS01 transfers the “logical” message types ORDERS (purchase order) and ORDRSP (order confirmation).
    Also check these link it will help you.
    idoc information
    http://help.sap.com/saphelp_nw2004s/helpdata/en/78/21785851ce11d189570000e829fbbd/frameset.htm
    https://www.sdn.sap.com/irj/sdn/wiki?path=/display/xi/sapR3%28Idocs%29ToXI--Steps+Summarized&
    /people/prateek.shah/blog/2005/06/08/introduction-to-idoc-xi-file-scenario-and-complete-walk-through-for-starters
    ALE/ IDOC/ XML
    Troubleshooting of ALE Process - /people/raja.thangamani/blog/2007/07/19/troubleshooting-of-ale-process
    http://www.sapgenie.com/sapgenie/docs/ale_scenario_development_procedure.doc
    http://www.thespot4sap.com/Articles/SAP_XML_Business_Integration.asp
    http://help.sap.com/saphelp_srm30/helpdata/en/72/0fe1385bed2815e10000000a114084/content.htm
    IDOC Convertion
    /people/kevin.wilson2/blog/2005/12/07/changing-fields-in-an-idoc-segment
    Please check this online document for ALE and IDoc.
    http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCMIDALEIO/BCMIDALEIO.pdf
    http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCMIDALEPRO/BCMIDALEPRO.pdf
    http://help.sap.com/printdocu/core/Print46c/en/data/pdf/CABFAALEQS/CABFAALEQS.pdf
    http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCSRVEDISC/CAEDISCAP_STC.pdf
    http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCSRVEDI/CAEDI.pdf
    Also check this links for additional information.
    http://help.sap.com/saphelp_erp2004/helpdata/en/dc/6b835943d711d1893e0000e8323c4f/content.htm
    http://www.sapgenie.com/sapgenie/docs/ale_scenario_development_procedure.doc
    http://edocs.bea.com/elink/adapter/r3/userhtm/ale.htm#1008419
    http://www.netweaverguru.com/EDI/HTML/IDocBook.htm
    http://www.sapgenie.com/sapedi/index.htm
    serialization /people/alessandro.guarneri/blog/2006/11/26/content-based-serialization-dynamic-queue-name-in-xi
    /people/prateek.shah/blog/2005/06/08/introduction-to-idoc-xi-file-scenario-and-complete-walk-through-for-starters - IDoc to File
    IDOc testing - /people/suraj.sr/blog/2005/12/29/generate-test-case-for-an-idoc-scenario
    /people/ravikumar.allampallam/blog/2005/06/24/convert-any-flat-file-to-any-idoc-java-mapping - Any flat file to any Idoc
    /people/pooja.pandey/blog/2005/07/27/idocs-multiple-types-collection-in-bpm - Collection of IDoc to Single File
    /people/stefan.grube/blog/2006/09/18/collecting-idocs-without-using-bpm - collecting IDocs without BPM
    /people/prateek.shah/blog/2005/06/08/introduction-to-idoc-xi-file-scenario-and-complete-walk-through-for-starters - IDoc to File
    Hope it will be useful to u....plz don't forget to reward points...!!!!
    Regards
    Vasu

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    I'm new to CRM,I would like to know  What is the procedure used to Load the data (ex: Business partners data ,Organization data,Sales data, etc.) from Legacy system into CRM system?
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