How To Fix DMCLG021 - Migration object &1 already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: DMCLG - DMC Tool Development

• Message number: 021

• Message text: Migration object &1 already exists

What causes this issue?

Names of projects, sub-projects, and conversion objects must be unique
across the system.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Choose a unique name.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DMCLG021 - Migration object &1 already exists ?

  The SAP error message DMCLG021, which states "Migration object &1 already exists," typically occurs during data migration processes when you attempt to create or import a migration object that already exists in the system. This can happen in various scenarios, such as during data uploads, migrations, or when using tools like SAP Data Services or SAP S/4HANA Migration Cockpit.
  Cause:
  
  Duplicate Migration Object: The migration object you are trying to create or import already exists in the target system.
  Previous Migration Attempt: A previous migration attempt may have created the object, and the system is preventing the creation of a duplicate.
  Incorrect Configuration: There may be a misconfiguration in the migration settings or parameters that leads to the system recognizing the object as already existing.
  
  Solution:
  
  
  Check Existing Migration Objects: 
  
  Use transaction codes like SE11 (Data Dictionary) or SE80 (Object Navigator) to check if the migration object already exists in the system.
  If it does exist, you may need to decide whether to update it, delete it, or skip the creation process.
  
  
  
  Delete or Modify Existing Object:
  
  If the existing migration object is no longer needed, you can delete it using the appropriate transaction or tool.
  If it needs to be modified, make the necessary changes to the existing object instead of creating a new one.
  
  
  
  Review Migration Settings:
  
  Ensure that the migration settings and parameters are correctly configured to avoid conflicts with existing objects.
  Check for any naming conventions or identifiers that may lead to confusion.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific migration tool you are using for additional guidance on handling migration objects.
  
  
  
  Error Handling in Scripts:
  
  If you are using scripts or automated processes for migration, implement error handling to manage cases where objects already exist.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Migration Tools: Familiarize yourself with the specific migration tool you are using (e.g., SAP S/4HANA Migration Cockpit, SAP Data Services) as they may have unique features or settings that can help resolve this issue.
  Community Forums: Engage with SAP community forums or support channels for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the DMCLG021 error and successfully manage your migration objects.