How To Fix M8128 - System lock error: Inform system administrator

SAP Error Message - Details

• Message type: E = Error

• Message class: M8 - Invoice Verification/Valuation

• Message number: 128

• Message text: System lock error: Inform system administrator

What causes this issue?

A system error has occurred during blocking.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Please inform your system administrator.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message M8128 - System lock error: Inform system administrator ?

  The SAP error message M8128, which indicates a "System lock error: Inform system administrator," typically arises when there is an issue with the locking mechanism in the SAP system. This can occur during various operations, such as when trying to post a document or perform a transaction that requires exclusive access to certain data.
  Causes:
  
  Lock Table Issues: The lock table may be full or not functioning correctly, preventing new locks from being created.
  Long-Running Transactions: A transaction that holds a lock for an extended period can block other transactions from acquiring the necessary locks.
  Deadlocks: Two or more transactions may be waiting for each other to release locks, leading to a deadlock situation.
  Database Issues: Problems with the underlying database can also lead to locking issues.
  Configuration Issues: Incorrect configuration settings in the SAP system can lead to locking problems.
  
  Solutions:
  
  Check Lock Entries: Use transaction code SM12 to check for existing lock entries. You can delete unnecessary locks if they are no longer needed.
  Monitor Long-Running Transactions: Use transaction code SM66 or SM50 to monitor active processes and identify any long-running transactions that may be holding locks.
  Analyze Deadlocks: If you suspect a deadlock, you can analyze the situation using transaction code SM21 (System Log) to check for any deadlock messages.
  Database Check: Ensure that the database is functioning correctly and that there are no issues with the database server.
  System Configuration: Review the configuration settings related to locking in the SAP system to ensure they are set correctly.
  Restart the Application Server: In some cases, restarting the application server may help resolve temporary locking issues.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address specific issues related to the M8128 error.
  
  Related Information:
  
  
  Transaction Codes:
  
  SM12: Display and manage lock entries.
  SM21: View system logs for error messages.
  SM50: Monitor processes on the application server.
  SM66: Monitor global processes across all application servers.
  
  
  
  SAP Support: If the issue persists after trying the above solutions, it may be necessary to contact SAP support for further assistance. Provide them with detailed information about the error, including any relevant logs and the steps that led to the error.
  
  
  Documentation: Refer to SAP documentation for more detailed information on locking mechanisms and troubleshooting steps.
  
  
  By following these steps, you should be able to diagnose and resolve the M8128 error in your SAP system.