How To Fix CN805 - System error when locking

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 805

• Message text: System error when locking

What causes this issue?

An error occurred when you attempted to lock Table AFAB.

System Response

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

INCLUDE 'NA_ALLG_NOVERARBEITUNG' OBJECT DOKU ID TX

How to fix this error?

INCLUDE 'NA_ALLG_SYSTEMVERW'

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN805 - System error when locking ?

  The SAP error message CN805 ("System error when locking") typically occurs when there is an issue with the locking mechanism in the SAP system. This can happen for various reasons, including database issues, inconsistencies in the lock table, or problems with the application itself.
  Causes:
  
  Database Lock Issues: The database may have encountered a problem that prevents it from properly managing locks.
  Lock Table Overflow: The lock table may be full, which can prevent new locks from being created.
  Inconsistent Lock Entries: There may be inconsistencies in the lock entries, possibly due to a previous system crash or improper termination of a transaction.
  System Resource Issues: Insufficient system resources (like memory or CPU) can lead to locking problems.
  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. You can delete any unnecessary or stale locks that may be causing the issue.
  Monitor System Resources: Ensure that the system has adequate resources (memory, CPU) and that there are no performance bottlenecks.
  Database Consistency Check: Perform a consistency check on the database to ensure that there are no underlying issues.
  Restart the Application Server: Sometimes, restarting the application server can resolve temporary locking issues.
  Check for Updates: Ensure that your SAP system is up to date with the latest patches and updates, as these may contain fixes for known issues.
  Review System Logs: Check the system logs (transaction SM21) for any related error messages that could provide more context on the issue.
  Contact SAP Support: If the issue persists, consider reaching out to SAP support for further assistance, especially if it appears to be a bug or a more complex issue.
  
  Related Information:
  
  Transaction Codes:
  
  SM12: Display and manage lock entries.
  SM21: System log for monitoring system messages.
  SM37: Job monitoring, to check if any background jobs are causing issues.
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide additional troubleshooting steps.
  Documentation: Review SAP documentation related to locking mechanisms and database management for more insights.
  
  By following these steps, you should be able to diagnose and resolve the CN805 error in your SAP system.