How To Fix /SAPDMC/LSMW100 - Define source fields first

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPDMC/LSMW -

• Message number: 100

• Message text: Define source fields first

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPDMC/LSMW100 - Define source fields first ?

  The SAP error message /SAPDMC/LSMW100 Define source fields first typically occurs in the context of using the Legacy System Migration Workbench (LSMW) in SAP. This error indicates that the source fields for the data migration process have not been defined or configured properly before attempting to execute the data load.
  Cause:
  
  Missing Source Fields: The most common cause of this error is that the source fields have not been defined in the LSMW project. This means that the system does not know which fields to map from the source data to the target SAP fields.
  Incorrect Project Configuration: The LSMW project may not be set up correctly, leading to the inability to identify the source fields.
  Improper Execution Sequence: The steps in the LSMW process may not have been followed in the correct order, leading to this error.
  
  Solution:
  To resolve the error, follow these steps:
  
  
  Define Source Fields:
  
  Go to the LSMW transaction (LSMW).
  Navigate to the project, subproject, and object where you are encountering the error.
  In the "Maintain Source Fields" step, define the source fields that correspond to the data you are trying to migrate. This involves specifying the field names, data types, and lengths.
  
  
  
  Check Project Configuration:
  
  Ensure that all necessary configurations for the LSMW project are completed. This includes defining the source structure, field mapping, and any other required settings.
  
  
  
  Follow Execution Sequence:
  
  Make sure you are following the correct sequence of steps in the LSMW process. The typical sequence includes:
  
  Maintain Object Attributes
  Maintain Source Structures
  Maintain Source Fields
  Maintain Field Mapping and Conversion Rules
  Read Data
  Convert Data
  Import Data
  
  
  
  
  
  Test the Configuration:
  
  After defining the source fields, test the configuration by executing the data load process again to ensure that the error does not reoccur.
  
  
  
  Related Information:
  
  Documentation: Refer to the SAP Help Portal or the specific documentation for LSMW for detailed instructions on how to set up and configure your migration project.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as LSMW, SE11 (Data Dictionary), and SE37 (Function Modules) for further troubleshooting.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues or provide additional guidance related to LSMW and data migration.
  
  By following these steps, you should be able to resolve the /SAPDMC/LSMW100 Define source fields first error and successfully proceed with your data migration process in SAP.