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

/SCWM/UI134 - Overview

• Message type: E = Error

• Message class: /SCWM/UI -

• Message number: 134

• Message text: External key is not unique

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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/SCWM/UI134 - Details

• 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