How To Fix DMC_DTL129 - Combination of import values already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_DTL - Messages for DMC data transfer layer

• Message number: 129

• Message text: Combination of import values already exists

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DMC_DTL129 - Combination of import values already exists ?

  The SAP error message DMC_DTL129: Combination of import values already exists typically occurs in the context of data migration or data import processes, particularly when using the SAP Data Migration Cockpit or similar tools. This error indicates that the system has detected a duplicate entry based on the combination of values being imported.
  Cause:
  The error is caused by attempting to import data that has a combination of key fields (like unique identifiers) that already exists in the target system. This can happen due to:
  
  Duplicate Data: The data being imported contains records that are identical to those already present in the target system.
  Incorrect Mapping: The mapping of fields during the import process may not be set up correctly, leading to unintended duplicates.
  Data Integrity Constraints: The target database may have constraints (like primary keys or unique indexes) that prevent the insertion of duplicate records.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check for Duplicates: Review the data you are trying to import to identify any duplicates. You can do this by querying the target system or by analyzing the import file.
  
  
  Modify the Data: If duplicates are found, you can either:
  
  Remove the duplicate records from the import file.
  Update the existing records in the target system instead of trying to insert them again.
  
  
  
  Adjust Mapping: Ensure that the mapping of fields in the import process is correct. Verify that the fields that should be unique are properly defined.
  
  
  Use Upsert Logic: If your import process supports it, consider using an "upsert" (update or insert) approach, which will update existing records if they exist and insert new records if they do not.
  
  
  Check Data Integrity Constraints: Review the constraints in the target system to understand what combinations of fields are considered unique. This can help you adjust your data accordingly.
  
  
  Log and Analyze: If the issue persists, enable logging for the import process to capture more detailed information about the error. This can help in diagnosing the root cause.
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for the Data Migration Cockpit or the specific tool you are using for more detailed guidance on handling data imports.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and what solutions they found effective.
  Data Quality Tools: Consider using data quality tools to cleanse and deduplicate your data before attempting the import.
  
  By following these steps, you should be able to resolve the DMC_DTL129 error and successfully complete your data import process.