How To Fix /SAPDMC/LSMW302 - Define source structures first

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPDMC/LSMW -

• Message number: 302

• Message text: Define source structures first

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPDMC/LSMW302 - Define source structures first ?

  The SAP error message /SAPDMC/LSMW302 Define source structures first typically occurs in the context of using the Legacy System Migration Workbench (LSMW) in SAP. This error indicates that the source structures for the data migration process have not been defined before attempting to execute a migration project.
  Cause:
  The error is caused by the absence of defined source structures in the LSMW project. Source structures are essential as they define the format and structure of the data that you want to migrate into the SAP system. Without these definitions, the system cannot proceed with the data migration process.
  Solution:
  To resolve this error, you need to define the source structures in your LSMW project. Here are the steps to do this:
  
  
  Access LSMW:
  
  Go to transaction code LSMW in your SAP system.
  
  
  
  Select Your Project:
  
  Choose the appropriate project, subproject, and object where you want to define the source structures.
  
  
  
  Define Source Structures:
  
  Navigate to the "Source Structures" step in the LSMW menu.
  Click on the "Create" button to define a new source structure.
  Enter a name and description for the source structure.
  Save your entries.
  
  
  
  Define Source Fields:
  
  After defining the source structure, you will need to define the fields that will be included in this structure.
  Go to the "Source Fields" step and create the necessary fields that correspond to the data you are migrating.
  
  
  
  Map Fields:
  
  Once the source structures and fields are defined, you can proceed to map these fields to the target fields in the SAP system.
  
  
  
  Execute the Migration:
  
  After completing the necessary definitions and mappings, you can execute the migration process.
  
  
  
  Related Information:
  
  Documentation: Refer to the SAP Help Portal or the LSMW documentation for detailed guidance on defining source structures and fields.
  Transaction Codes: Familiarize yourself with other relevant transaction codes such as SE11 (Data Dictionary) and SE37 (Function Modules) if you need to create or modify data structures.
  Testing: Always test your migration process in a development or quality assurance environment before executing it in production to ensure that everything works as expected.
  
  By following these steps, you should be able to resolve the /SAPDMC/LSMW302 Define source structures first error and successfully proceed with your data migration project in SAP.