How To Fix DMC_RT_MSG137 - Key &1 already exists in previous file

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_RT_MSG - DMC: Runtime Object Messages

• Message number: 137

• Message text: Key &1 already exists in previous file

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DMC_RT_MSG137 - Key &1 already exists in previous file ?

  The SAP error message DMC_RT_MSG137 with the description "Key &1 already exists in previous file" typically occurs in the context of data migration or data transfer processes, particularly when using the Data Migration Cockpit (DMC) or similar tools. This error indicates that there is a duplicate key in the data being processed, which violates the uniqueness constraint expected by the system.
  Cause:
  
  Duplicate Keys: The most common cause of this error is that the data being imported contains duplicate entries for a key that is supposed to be unique. For example, if you are trying to import customer records, and the same customer ID appears more than once in the data file, this error will be triggered.
  Incorrect Data Preparation: The data files may not have been properly cleaned or prepared before the import, leading to duplicates.
  Multiple Files: If you are processing multiple files, the same key might exist in different files, causing a conflict.
  
  Solution:
  
  Check for Duplicates: Review the data file(s) you are trying to import. Look for duplicate entries for the key mentioned in the error message. You can use spreadsheet software or database queries to identify duplicates.
  Remove Duplicates: Once identified, remove or consolidate the duplicate entries in your data file. Ensure that each key is unique before attempting the import again.
  Data Validation: Implement data validation checks before the import process to catch duplicates early. This can include using tools or scripts to validate the uniqueness of keys in your data.
  Review Import Process: If you are using multiple files, ensure that the keys across all files are unique. You may need to adjust your import strategy to handle this.
  Consult Documentation: Refer to the SAP documentation for the specific data migration tool you are using for any additional guidelines or best practices regarding data preparation.
  
  Related Information:
  
  Data Migration Cockpit (DMC): This is a tool provided by SAP for migrating data into SAP S/4HANA and other SAP systems. Understanding how it handles data and keys can help in troubleshooting.
  Error Logs: Check the error logs or detailed messages provided by the DMC for more context on the error. This can help identify which specific key is causing the issue.
  SAP Community: Engaging with the SAP Community forums can provide insights from other users who may have encountered similar issues.
  
  By addressing the root cause of the duplicate keys and ensuring proper data preparation, you should be able to resolve the DMC_RT_MSG137 error and successfully complete your data import.