You can use the LSMW if the source structures are simple, like this for example:
A comparison of functions between the legacy system and the SAP system must have been carried out. The data to be migrated is determined from this comparison.
LSMW supports a step-by-step procedure. On the List of steps screen, the next step is automatically displayed for each step.
The following basic steps are included in the LSMW:
1. Maintaining Object Attributes Here, you define the project, subproject and the required (business) object. If a suitable SAP standard import program is not available, you can use the recording function to create a user-specific, new object.
4. Maintaining Structure Relationships In these steps, you define the structures and fields of the project. These describe the transfer file and must have the same format in the export program. You then relate the structures and fields of the SAP system to those of the project.
Values, Conversions and User-Defined Routines: Here, you define the
conversion rules for processing project data. The system generates the
conversion program from the structure and field relationships as well as the
You then perform Migration Customizing. That is, you assign values to the fixed values and translation values and specify the definite variants for the conversion rules.
11. Converting Data
16. Start IDoc-Postprocessing: The converted data is transferred to the SAP system. The import technique or method has already been assigned to the object by selecting the object type in the first step.
The data from the legacy system has been imported into the SAP database. Any subsequent processes result from the type of datasets migrated.
For more details about migrating data with the LSMW, see: