How To Fix DMC_GENERAL420 - Migration object is defined for table &1

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_GENERAL - MWB: General Messages

• Message number: 420

• Message text: Migration object is defined for table &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DMC_GENERAL420 - Migration object is defined for table &1 ?

  The SAP error message DMC_GENERAL420 typically occurs during data migration processes, particularly when using the SAP Data Migration Cockpit (DMC). This error indicates that a migration object has been defined for a specific table, which may lead to conflicts or issues during the migration process.
  Cause:
  The error message DMC_GENERAL420 is usually triggered by one of the following reasons:
  
  Duplicate Migration Object: The migration object for the specified table is already defined in the system, which can lead to conflicts if you attempt to define it again.
  Incorrect Configuration: There may be an issue with the configuration of the migration object, such as incorrect mapping or settings that do not align with the source or target data structures.
  Data Consistency Issues: The data being migrated may not meet the requirements or constraints defined for the migration object, leading to validation errors.
  
  Solution:
  To resolve the DMC_GENERAL420 error, you can take the following steps:
  
  
  Check Existing Migration Objects:
  
  Verify if the migration object for the specified table is already defined in the system. You can do this by navigating to the Data Migration Cockpit and checking the list of defined migration objects.
  If it exists, review its configuration to ensure it meets your requirements.
  
  
  
  Modify or Delete Existing Migration Object:
  
  If the existing migration object is not needed, consider deleting it or modifying it to fit your current migration needs.
  If you need to keep the existing object, ensure that your new migration object has a different name or identifier.
  
  
  
  Review Configuration:
  
  Check the configuration settings for the migration object, including field mappings, data types, and constraints. Ensure that they align with the source and target data structures.
  Make any necessary adjustments to the configuration to resolve inconsistencies.
  
  
  
  Data Validation:
  
  Validate the data you are trying to migrate to ensure it meets the requirements of the migration object. This includes checking for data types, mandatory fields, and any other constraints.
  
  
  
  Consult Documentation:
  
  Refer to the official SAP documentation for the Data Migration Cockpit for detailed guidance on defining and managing migration objects.
  
  
  
  Seek Support:
  
  If the issue persists after trying the above solutions, consider reaching out to SAP support or consulting with an SAP expert who can provide further assistance.
  
  
  
  Related Information:
  
  SAP Data Migration Cockpit (DMC): A tool used for migrating data from legacy systems to SAP S/4HANA or other SAP systems.
  Migration Objects: These are predefined structures that define how data should be migrated from the source to the target system.
  Error Logs: Check the error logs in the Data Migration Cockpit for more detailed information about the error and any related issues.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.