How To Fix SG844 - Key value &1 already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: SG - Global Pool for Cross-Application Developments

• Message number: 844

• Message text: Key value &1 already exists

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SG844 - Key value &1 already exists ?

  The SAP error message SG844 ("Key value &1 already exists") typically occurs when you are trying to create or update a record in a database table where a unique key constraint is violated. This means that the value you are trying to insert or update already exists in the table for a field that is defined as unique.
  Cause:
  
  Duplicate Entry: You are attempting to insert a record with a key value that already exists in the database.
  Data Migration Issues: If you are migrating data from one system to another, there may be conflicts with existing records.
  Incorrect Logic in Custom Code: If you have custom ABAP code or enhancements, there may be logic that does not properly check for existing records before attempting to insert new ones.
  Concurrent Processing: Multiple users or processes may be trying to insert the same key value at the same time.
  
  Solution:
  
  Check Existing Records: Before inserting or updating, check the database table to see if the key value already exists. You can do this using transaction codes like SE16 or SE11 to view the table data.
  Modify Key Value: If the key value is indeed a duplicate, consider using a different value that does not conflict with existing records.
  Adjust Custom Code: If the error is coming from custom ABAP code, review the logic to ensure it checks for existing records before attempting to insert.
  Handle Concurrent Processes: If multiple processes are causing the issue, consider implementing locking mechanisms or handling exceptions to manage concurrent access.
  Data Cleanup: If the error arises from data migration, ensure that the data being migrated does not contain duplicates or conflicts with existing records.
  
  Related Information:
  
  Transaction Codes: Use SE16 or SE11 to view the table and check for existing records.
  Database Constraints: Understand the unique constraints defined on the table in question. You can check this in the Data Dictionary (SE11).
  Debugging: If the error is coming from custom code, use the ABAP debugger to trace the execution and identify where the duplicate key is being generated.
  SAP Notes: Check the SAP Support Portal for any relevant notes or updates related to this error message, as there may be specific fixes or recommendations based on your SAP version.
  
  By following these steps, you should be able to identify the cause of the SG844 error and implement a solution to resolve it.