Monday, 6 June 2016

How to Migrate Data using LSMW

Enter Transaction LSMW in SAP ,to start the workbench.


LSMW workbench shows the following information-
  • 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 a further structuring attribute.
  • Object : An ID with a maximum of 10 characters to name the business object.
Enter Project ID , Subproject ID , Object ID.  Click Execute The next screen gives the STEPS in your LSMW data Migration


You can select a desired step and click execute. Lets look into each step in details

Step 1- Maintain Object Attributes.

There are four Modes of Data Transfer :
  1. Standard/ Batch Input : Standard upload Programs
  2. Batch Input Recording : Here you can create a recording of your own and use it to upload / change data
  3. BAPIs : Standard BAPIs are used to upload Data
  4. IDOCs : Any Inbound IDOC function modules can be used to process the data
Based on the requirement we try to find a suitable method to be processed. If it is a standard Master we can find it in the first method, Otherwise we try to use BAPIs or Idocs. If the requirement is a very custom one we use a recording to process the data.

Step 2 - Maintain  Source Structures


The source structures can be used to design the hierarchy of the files to be uploaded.

Step 3- Maintain  Source Fields

In this screen,the Fields which will be uploaded from the text file can be maintained here. The fields with identical names are taken as the Key


Source Filed  is used to identify whether a certain record should go to the specified structure. Eg : Suppose a file contains header rows and item rows, we can specify the first field as the indicator say 'H' for header and 'I' for Item. Thus when the file is being read, it checks the first field, if it is 'H' then it is read into the Header source structure else it is written to the item source structure.
The Source fields can be easily maintained in the form of a table maintenance.

Step 4 - Maintain Structure Relationships

The Structures which are needed for the processing of the data need to be assigned here. The Object may contain many structures and many source structures. The Mapping between the source and the target structures should be done after careful checking.



Step 5- Maintain Field Mapping and Conversion Rules

In this step, you assign source fields to target fields and define how the field contents will be converted.

  All fields of all target structures, 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.
 Note: Some fields are preset by the system. These fields are called "technical fields" are marked with "Default setting". The coding for these fields is not displayed when first entering the fieldmapping; it can be displayed via the display variant. Changing the default setting may seriously affect the flow of the data conversion. If you erroneously changed the default setting, you can restore it by choosing Extras -> Restore default.

Step 6- Maintain Fixed Values,Translations and User-written Routines

Here the 3 reusable functions are maintained :
  1. Fixed Values : Fixed values are values which are fixed across the project eg : Company Code. We can assign a fixed value to BUKRS and this fixed value can be used in all the objects in this project. So if the value changes we can only change at one place i.e. in the fixed values instead of changing in each and every object.
  2. Translations : Here you can maintain the fixed translation for any legacy field and the translation can be assigned to the filed in Field Mapping and Conversion Rules. Translation can be 1:1 or many : 1 etc.
  3. User Defined Routines : These are user defined subroutines that are used in the object for processing the data.
All the Three functions mentioned above are reusable Rules which are valid for all objects in one Project.


Step7- Specify Files

Here we define the Files that we use to upload the data. The File can be on the Front end or in the application server.


Step 8-  Assign Files

Here we define which file we are going to use for current upload i.e. whether the file is on Presentation server or application server.


Step 9- Read Data

Reading the data from the file gives us an option to read only a few records and not the entire chunk in order to enable testing of first few records. This also provides the user defined selection parameter which can be used to restrict the read data based on the condition specified.

Step 10- Display Read Data

  • In this step, you can display all or a part of the read data in table form. Clicking on a line displays all information for this line in a clear way. The same happens when you click on Field contents.
  • Change display allows to select either a one-line or multi-line view.
  • Display color palette displays the colors for the individual hierarchy levels.

Step 11- Convert Data

Converting the data is the transfer of data from source to target structures based on the conversion routines written in maintain Field Mapping and conversion routines.


Step 12- Import Data

The steps displayed by the program depend on the selected object type:
Standard batch input or recording:
  1. Generate batch input session
  2. Run batch input session
Standard direct input:
  1. Start direct input session
BAPI or IDoc:
  1. Start IDoc creation
  2. Start IDoc processing
  3. Create IDoc overview
  4. Start IDoc post processing
This completes a detailed overview of steps to transfer your data using LSMW in SAP.


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