How To Fix DMU023 - Alternative segment & was deleted from the buffer

SAP Error Message - Details

• Message type: E = Error

• Message class: DMU - Digital Mock Up (DMU)

• Message number: 023

• Message text: Alternative segment & was deleted from the buffer

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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Smart SAP Assistant

• What is the cause and solution for SAP error message DMU023 - Alternative segment & was deleted from the buffer ?

  The SAP error message DMU023, which states "Alternative segment & was deleted from the buffer," typically occurs in the context of the SAP Data Migration Workbench or during the use of the Data Migration Utility (DMU). This error indicates that a specific alternative segment (a data structure or configuration) has been removed from the buffer, which can lead to issues when trying to access or manipulate that data.
  Cause:
  
  Data Buffer Management: The error often arises due to the way SAP manages data buffers. If the alternative segment is no longer available in the buffer, it may have been deleted due to memory management or because it was not properly loaded.
  Session Timeout: If the session has timed out or if there has been a long period of inactivity, the buffer may have been cleared.
  Data Consistency Issues: There may be inconsistencies in the data being processed, leading to the removal of the segment from the buffer.
  Configuration Changes: Changes in the configuration or data model that affect the alternative segment can also lead to this error.
  
  Solution:
  
  Refresh the Buffer: Try refreshing the data buffer by reloading the relevant data or restarting the transaction. This can often resolve temporary issues.
  Check Session Activity: Ensure that your session is active and has not timed out. If it has, log back in and try the operation again.
  Review Data Consistency: Check for any inconsistencies in the data that might be causing the segment to be deleted. Ensure that all required data is present and correctly configured.
  Recreate the Alternative Segment: If the alternative segment is critical and has been deleted, you may need to recreate it in the system.
  Consult SAP Notes: Look for any relevant SAP Notes or documentation that may address this specific error. SAP frequently updates its knowledge base with solutions for known issues.
  Contact SAP Support: If the issue persists, consider reaching out to SAP Support for assistance. They can provide more detailed troubleshooting based on your specific system configuration and version.
  
  Related Information:
  
  SAP Documentation: Review the official SAP documentation related to the Data Migration Workbench and the specific transaction you are using.
  SAP Community: Engage with the SAP Community forums where other users may have encountered similar issues and can share their solutions.
  System Logs: Check system logs (transaction SM21) for any additional error messages or warnings that may provide more context about the issue.
  
  By following these steps, you should be able to diagnose and resolve the DMU023 error in your SAP environment.