How To Fix /SCWM/UI134 - External key is not unique

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCWM/UI -

• Message number: 134

• Message text: External key is not unique

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCWM/UI134 - External key is not unique ?

  The SAP error message /SCWM/UI134 External key is not unique typically occurs in the context of SAP Extended Warehouse Management (EWM) when there is an attempt to create or process an object (like a handling unit, stock, or document) that requires a unique external key, but the system finds multiple entries with the same key.
  Cause:
  
  Duplicate External Keys: The most common cause of this error is that the external key being used (e.g., a handling unit number, stock number, or document number) is already associated with another object in the system.
  Data Migration Issues: If data has been migrated from another system or if there have been manual entries, it’s possible that duplicates were introduced.
  Configuration Issues: Incorrect configuration in the system that allows for non-unique keys to be created or processed.
  
  Solution:
  
  
  Check for Duplicates: 
  
  Use transaction codes like /SCWM/PRDI or relevant reports to search for existing entries with the same external key.
  Identify and resolve any duplicates by either deleting or modifying the conflicting entries.
  
  
  
  Correct Data Entry: 
  
  Ensure that when creating new entries, the external key is unique. Implement checks or validations in the data entry process to prevent duplicates.
  
  
  
  Data Cleanup: 
  
  If duplicates are found, you may need to clean up the data. This could involve deleting or merging records, depending on business requirements.
  
  
  
  Review Configuration: 
  
  Check the configuration settings in SAP EWM related to external keys. Ensure that the system is set up to enforce uniqueness where necessary.
  
  
  
  Consult Documentation: 
  
  Review SAP documentation or notes related to this error message for any specific guidance or patches that may address the issue.
  
  
  
  Engage SAP Support: 
  
  If the issue persists and cannot be resolved through the above steps, consider reaching out to SAP support for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes in SAP EWM that can help in troubleshooting, such as /SCWM/PRDI for displaying handling units or stock.
  SAP Notes: Check for any SAP Notes that may address this specific error or provide additional context.
  User Exits and BAdIs: If you have custom developments, review any user exits or BAdIs that might be affecting the handling of external keys.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.