How To Fix N2M251 - Active association no longer included: Not possible to lock

SAP Error Message - Details

• Message type: E = Error

• Message class: N2M - Global Trade: Item Category Management

• Message number: 251

• Message text: Active association no longer included: Not possible to lock

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 N2M251 - Active association no longer included: Not possible to lock ?

  The SAP error message N2M251, which states "Active association no longer included: Not possible to lock," typically occurs in the context of SAP's data management and locking mechanisms. This error can arise in various scenarios, particularly when dealing with data records that are being accessed or modified concurrently by multiple users or processes.
  Cause:
  
  
  Concurrency Issues: The error often indicates that the system is unable to lock a particular record because it is already locked by another user or process. This can happen in environments where multiple users are trying to access or modify the same data simultaneously.
  
  
  Session Timeout: If a session has timed out or if there is a disconnection, the active association may no longer be valid, leading to this error.
  
  
  Data Consistency: The system may have detected that the data state has changed since the last read, making it impossible to lock the record for further processing.
  
  
  Configuration Issues: There may be issues with the configuration of the application or the database that prevent proper locking mechanisms from functioning.
  
  
  Solution:
  
  
  Check for Locks: Use transaction codes like SM12 to check for existing locks on the record. If another user is holding a lock, you may need to wait until they release it.
  
  
  Session Management: Ensure that your session is active and has not timed out. If it has, try logging back in and reattempting the operation.
  
  
  Data Refresh: Refresh the data or re-fetch the record to ensure you are working with the most current version. This can help in cases where the data has changed since it was last read.
  
  
  Error Handling: Implement error handling in your application to gracefully manage situations where locks cannot be obtained. This may include retry logic or user notifications.
  
  
  Consult Documentation: Review SAP documentation or notes related to this specific error message for any additional context or updates that may apply to your version of SAP.
  
  
  Contact Support: If the issue persists, consider reaching out to SAP support for assistance, especially if it appears to be a systemic issue affecting multiple users.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (to view locks), SM21 (to check system logs), and ST22 (to analyze dumps) for troubleshooting.
  SAP Notes: Search for SAP Notes related to N2M251 for any patches or updates that may address the issue.
  User Training: Ensure that users are trained on proper data handling and locking practices to minimize concurrency issues.
  
  By following these steps, you should be able to diagnose and resolve the N2M251 error effectively.