How To Fix LQ405 - Unknown error occurred when locking Table &

SAP Error Message - Details

• Message type: E = Error

• Message class: LQ - Proposal Pool Management

• Message number: 405

• Message text: Unknown error occurred when locking Table &

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.

Unfortunately, there isn't any extra information in this error notice.

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Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message LQ405 - Unknown error occurred when locking Table & ?

  The SAP error message LQ405 ("Unknown error occurred when locking Table &") typically indicates that there is an issue with the locking mechanism in the SAP system, specifically related to the table mentioned in the error message. This can occur in various scenarios, such as during data processing, updates, or when multiple users are trying to access the same data concurrently.
  Possible Causes:
  
  Database Lock Conflicts: Another transaction may have locked the table, preventing your transaction from acquiring the necessary lock.
  Database Issues: There may be underlying database issues, such as corruption or connectivity problems.
  System Performance: High system load or performance issues can lead to timeouts or failures in acquiring locks.
  Configuration Issues: Incorrect configuration settings in the SAP system or database can lead to locking issues.
  Transport Issues: If the error occurs during a transport, it may be related to the transport process itself.
  
  Solutions:
  
  Check Lock Entries: Use transaction code SM12 to check for existing lock entries. If you find locks that are no longer needed, you can delete them (ensure that you have the necessary authorizations).
  Review System Logs: Check the system logs (transaction SM21) for any related error messages or warnings that could provide more context about the issue.
  Database Health Check: Perform a health check on the database to ensure there are no underlying issues. This may involve checking for locks at the database level or running database-specific diagnostic tools.
  Increase Timeout Settings: If the issue is related to timeouts, consider increasing the timeout settings for database connections or SAP processes.
  Consult SAP Notes: Search the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide patches or updates.
  Restart the Application Server: In some cases, restarting the application server can help clear temporary issues related to locking.
  Contact SAP Support: If the issue persists and you cannot identify the cause, consider reaching out to SAP Support for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (for lock entries), SM21 (for system logs), and ST22 (for dump analysis).
  Performance Monitoring: Use transaction ST03N to monitor system performance and identify any bottlenecks that may be contributing to the locking issue.
  User Authorizations: Ensure that users have the appropriate authorizations to access and modify the data in the affected table.
  
  By following these steps, you should be able to diagnose and resolve the LQ405 error in your SAP system.