AB1007 – Conversion v1.0 LSMW Legacy System Migration Workbench
Legacy System Migration Workbench PrepareMe 1 TellMe 2 ShowMe 3 LetMe 4 HelpMe 5
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What is Data migration? • 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
Significance of data migration • Data migration comes in the end of R/3 implementation. • To start with Data Migration first configuration should be fully completed • Data migration is about 20% to 40% of the total implementation expenses.
Data migration tools The tools for data migration are:- • BDC (Batch Data Communication) • LSMW (Legacy System Migration Workbench)
Difference between BDC & LSMW • LSMW offers different technique for migrating data: Direct input, BAPI, Idoc, Batch input recording. While BDC basically uses batch input sessions and CALL TRANSACTION method. • Limit on number of records which can be uploaded in one session of BDC (999 records). No such limit in LSMW. • LSMW is more to do with configuration while BDC involves programming.
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What is LSMW? • The LSM Workbench is an R/3-based tool that supports you when transferring data from - Non-SAP systems ("Legacy Systems") to R/3 - Once or Periodically. • The tool supports conversion of data • The data can be imported into the R/3 system via - Batch Input - Direct Input - BAPI’s - IDocs.
LSMW The LSM Workbench is a tool that supports data transfer from non-SAP systems to R/3. The main functions of the LSM Workbench are: - Import data (legacy data in spreadsheet tables and/or sequential files) - Convert data (from source format to target format) - Import data (into the database of the R/3 application)
Principles of LSM Workbench • Basic Principles of LSM workbench:- • Most of the functions should reside in R/3. No collection of individual programs on different platforms. • The quality and consistence of the data imported into R/3 should be more important than speed and performance of data migration. • Existing knowledge and coding should be used. • The developed ”mapping" and rules should be reusable and thus be used repeatedly in projects.
Features of LSMW • Features:- • Integrated in R/3 and thus independent of individual platforms • The import technique to be used in an individual case, depends on the business object as well as on the availability of standard input programs • Data consistency due to standard import techniques: Batch input Direct input BAPIs (Business Application Programming Interfaces) IDocs (Intermediate Documents) • Structured way of working, because you have to finish every step before starting the next step
Pre-requisites for LSMW • Make sure that SAP customizing is finished. • Run the relevant transaction in the SAP system manually with test data from the legacy system and see which fields must be filled. There may be required fields that do not correspond to data fields in the legacy system. In such a case, one should better assign a fixed value or establish an optional field for data transfer. • Map the fields in advance in written form: Assign the source fields to the target fields. • Determine the form in which non-SAP data will be transferred into the SAP system (e.g. via "Move" or according to a rule).
Import methods… Preferred methods of input are described in order of preference: • IDOC’s Advantages: Fast to load, easy processing, low programming for standard IDOC’s Disadvantages: Good knowledge of IDOC processing required, time consuming if changes have to be made to a created IDOC 2. BAPI’s Advantages: Fast to load, easy processing, logical interface for functional/end user based on the business processes involved. Disadvantages: Not always complete with all input fields of a transaction
Import Methods… 3. Standard/Direct Input Advantages: Well tested method, Fast to load, easy processing. Disadvantages: No enjoy transactions, not always complete with all input fields of a transaction. 4. Batch Input Advantages: Easy modifiable, all fields are available, easy re-processing. Disadvantages: Comparatively slow, to use new screens or tabs a new recording has to be created, not easily usable for enjoy transactions, dependant on user settings, difference in foreground and background processing may occur.
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Getting Started Here is an example showing the way to use the conversion tool LSMW in SAP. It starts in the start-up screen of LSMW transaction and ends with a screen on which the results of the conversion are displayed If you want to create or change objects, make sure that you are working in change mode. To activate this mode, click Change in the corresponding processing step. Only this mode provides all functions required for changing objects
Step 1 - Enter transaction LSMW Enter the transaction code (LSMW) or add this transaction to your favourites (right-click with your mouse on the Favourites map in the start menu and choose Insert transaction, type lsmw and press enter), since LSMW is an additional transaction, it is not available in the standard SAP menu.
Step 2 – project, subproject, objects At the initial screen, you can create a new project, corresponding subprojects and objects via Edit -> Create new entry. Alternatively you can select from an existing project • Project:An ID with a maximum of 10 characters to name your data transfer project. If you want to transfer data from several legacy systems, you may create a project e.g. for every legacy system • Subproject:An ID with a maximum of 10 characters that is used as further structuring attribute • Object:An ID with a maximum of 10 characters to name the business object
Step2 contd.. - At the initial screen, ‘All Objects’ provides a list of all projects created already. - ‘My Objects’ displays a list of all objects you created personally - ‘All Project Objects’ displays all objects of the selected project as tree structure. - ‘Project Documentation’ displays any documentation written for the individual pop-ups and processing steps. You can print the project documentation out, send it and save it in various file formats. - Select ‘Documentation’ to enter your notes. After clicking, a popup is displayed in which you can write down your personal documentation.
Initial Screen By clicking the button execute or pressing the F8 key on your keyboard you go to the object, you selected. By clicking the button create a new object for the selected project and subproject with the name entered in the object field is created. By positioning the cursor on an entry and clicking on the button documentation, you can add change or delete comments.
Administration - list of existing projects Project In the initial screen, you can display the administration functions via the menu path Goto Administration. Here you can find a list of all existing projects. It enables you to create, process, display, delete, copy or rename projects, subprojects, objects and reusable rules. By double-clicking on an entry you can branch to the entry display. Subproject Object
Step 3 – Execute Once the project and subproject along with the object are determined we execute to find the list of steps to be performed for data transfer
Process steps • The number of process steps is dynamic and shall depend on factors like input method • By clicking the ‘User menu’ button one can select – deselect the Process steps • To proceed through the processing steps one needs to start from the first one and execute each of them • A step can be skipped by selecting the next available processing steps’ radio button
Maintain object attributes Choose if the data transfer is once or periodic If Batch input recording is selected one can enter further recordings by clicking at the arrow Choose method for input of data. In the method to input data from a BAPI, one needs to select the Business Object and the corresponding method.
Application Toolbar in Process steps User Menu: Here you can make an individual selection from the displayed processing steps. Pressing button ‘Main steps’ automatically activates all processing steps mandatory for a data conversion. Numbers On or Off: You can activate or deactivate the numbering of the individual processing steps. Double click = Display or Double click = Change: Here, you can determine whether display mode or change mode is selected by double clicking. Object overview: Displays all object information for the selected object. Information includes object information, source structures, target structures, structure relations, source fields, target fields, field mapping. Action log: Displays a detailed overview for all processing steps already carried out. You can reset the action log via the menu path Extras -> Reset Action Log. This action is stored with a reference to the user and the date.
Maintain Source structures In the step ‘Maintain Source Structures’ you define the structures of the object with name, description and the hierarchical relationships: Click on Change button. You can now define, change, reassign or delete structures. All these functions are available via pushbuttons. When you define more than one structure, a popup is displayed querying the relations between the structures: equal/subordinate? Note: For migration objects created via transaction recording, you may only define one structure per recording, since only one flat target structure per recording is available.
Maintain source fields In the step ‘Maintain Source Fields’, fields are created and maintained for the source structure defined in the preceding step Use source fieldnames with the same names as the target fieldnames as much as possible, because it allows you to use the ‘auto-field mapping’ function in step 5 ‘Maintain field mapping and conversion rules’.
Maintain source fields Different possible ways of defining and maintaining the source fields: Make sure that you are in change mode and the cursor is positioned on a source structure or an existing source field • Create Individual source fields - By clicking on the button ‘Create source field’ you can specify the field name, field label, field length and field type During data read, you can specify whether date values are converted into the internal date format (YYYYMMDD) and amount fields are converted into the calculation format (1234.56) ‘Selection Parameter’ can be set during Read/Convert data. If you select this indicator, the corresponding field is made available as selection parameter when reading or converting data. 2. Maintain Source Fields in Table Form – Clicking on the ‘Table Maintenance’ button displays the fields in a tabular format.
Maintain source structure… contd Different possible ways of defining and maintaining the source fields: • 3.Copy Source Fields from Other Sources : By selecting ‘Copy Source Fields’ displays the following options: - Upload (Text separated with Tabs) – The source field description is stored in a text file the columns of which are separated by tabs - Copy from Another Object – Source field can be copied from source structure of another object - Copy from Data Repository – Source field can be copied from a structure in SAP Data Repository - From Data File (Field Name in 1 Line) - Source fields can be copied from a data file which should be stored on the PC in the form of text separated by tabs and contain the fields in the first line.
Maintain structure relations • In the step ‘Maintain Structure Relations’, the structural relationships between source and target structures are defined.The possible target structures are defined during the selection of the object type and the import technique • To define structural relationships, position the cursor on the field target structures. Clicking create Relationshipbutton opens a window that displays the existing source structures for selection • If you want to change the relation, remove the existing relation first. In addition, you can use Check to check the structural relationships for errors
Maintain Field mapping & conversion rules • In the step‘Maintain Field Mapping and Conversion Rules’, you assign source fields to target fields and define how the field contents will be converted • All fields of target structure, which you selected in the previous step, will be displayed. • For each target field the following information is displayed: - Field description - Assigned source fields (if any) - Rule type (fixed value, translation etc.) - Coding
Maintain Field mapping & conversion rules Layout determination • The layout of the ‘Maintain field mapping’ screen can be determined. i.e. we can decide whether the ‘Global data’, ‘Technical fields’ should be displayed
Maintain Field mapping & conversion rules • To assign a source field, position the cursor on a target field in the tree structure and select Assign source field. • This displays a list of all available source fields for selection. You can assign the fields by double-clicking on them as well
Maintain Field mapping & conversion rules • After assigning the source fields, you define the conversion rules. The default rule is ‘Move’. However, you can select various standard techniques via pushbutton: The target field is assigned coding carrying out field contents conversion using a translation table This deletes the coding assigned to the target field. In addition, source fields assigned to the target fields are removed as well. A ‘fixed value object’ (variable) named FV_<fixed value> is assigned to the target field. This fixed value object is filled with an actual value in step ‘Maintain Fixed Values, Translations, User-Defined Routines’. The target field is assigned a fixed value The data is transferred using ABAP command ‘Move’
Maintain field mapping & conversion rules By clicking this button, after clicking once on a target field (in blue), LSMW displays the list of available source fields, by choosing one the standard rule ‘move’ is used to link the 2 fields By clicking this button, after clicking once on a target field (in blue), the source field is deleted from the target field By clicking this button, the display of this step can be changed. There are possibilities to show or hide several aspects of the field mapping By clicking this button, a syntax check is performed for the conversion program, generated from the field mapping These 3 buttons, which are available for every target field, display the help function (‘I’), the possible entries (?) and the last one displays the documentation in LSMW
Maintain Fixed values, translations… In the step‘Maintain Fixed Values, Translations, User-Defined Routines’, you can process the reusable rules of a project, which are defined at project level, so they are the same for all objects • Fixed value: Here you can specify the length, type flag for lowercase/uppercase and value in addition to the name of the field. • Translation: Here you can enter information on the source field and the target field. If you are creating a new translation you have to save data first before you can change it • User Defined Routines: This routine can be re-used in other objects of the project. The system adds in ‘ur_’ to the name that you suggest to use for this routine. It opens up an editor wherein you can enter your ABAP code
Process Step- Specify File In the step ‘Specify Files’, you describe all files to be used If your legacy data is on the PC: In change mode, position the cursor on the line ‘Legacy data On the PC (Front-end)’. Select Add entry. A popup is displayed. Specify file path, file name and description and other properties • If your legacy data is on the R/3 server: In change mode, position the cursor on the line ‘ Legacy data On the R/3 server (application server)’. Select Add entry. A popup is displayed. Specify file path, file name and description and other properties • File for Imported data: Here, the file name is entered with file extension ’.lsmw.read’. • File for Converted data: Here, the file name is entered with file extension ’.lsmw.conv’. This file will contain all your converted data after applying the conversion rules if any.
Process Step – Assign File In the step ‘Assign Files’, you can assign the file name in step 7 declared as source file to the target structure defined in step 2. If you click on the Assign File button, after clicking once on a target structure (in yellow), LSMW displays the list of available source files. If you click on the Delete Assignment button, after clicking once on a target structure (in yellow), the source file is deleted from the target structure.
Process step – read data In the step’Read Data’, the file specified in previous step is, as linked to the target structures in . Even though you can select a range of transaction numbers, the whole file is being read, only the amount of transactions written is influenced. So for tests it is easier to read all data and convert only a certain range, because in that step the program stops after finishing the range.
Process Step – Display read data In the step‘Display Read Data’, you can display the read data, choosing to show all read data or an interval as shown above. The data are shown as the source structures, in case more source structures are being used in one transaction, the hierarchy of the transaction is displayed by the use of a different colour legend. By clicking on one of the lines, you proceed to the field level of the line, where you can check the read data as shown below.
Process Step – Convert data In the step‘Convert Data’, works like the step ‘read data’, but uses the conversion program instead of the read program. You can define a range of transactions to be converted, at the end of this range the conversion program stops running. Note: It is recommended that when you load big amount of data in production, load the first 10 records so that you can check and change when necessary.
Process Step - Display converted data In the step‘Display Converted Data’, you can display the converted data, choosing to show all converted data or an interval as shown above. The data are shown as the target structures, in case more target structures are being used in one transaction, the hierarchy of the transaction is displayed by the use of a different colour legend. By clicking on one of the lines, you proceed to the field level of the line, where you can check the converted data as shown below.
Process Step After the step‘Display Converted Data’the exact content of the next steps may differ, depending on the import technique that you have chosen in step 1. The steps displayed by the program for the different import techniques are: • Standard batch input or recording: Generate batch input session Run batch input session • Standard direct input: Start direct input session • BAPI or IDoc: Start IDoc creation Start IDoc processing Create IDoc overview Start IDoc post-processing
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Practical LSM Workbench Exercise 1 Create LSMW object and upload Vendor Master data to SAP
Practical LSM Workbench Exercise 2 Create LSMW object and upload Purchase Requisition data to SAP