How To Fix KI502 - System error when locking the data records

SAP Error Message - Details

• Message type: E = Error

• Message class: KI -

• Message number: 502

• Message text: System error when locking the data records

What causes this issue?

The lock to protect the data records being processed could not be set.
The probable reason for this is that the SAP locking table is full and
no more entries can be added.

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?

Inform your system administrator immediately.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message KI502 - System error when locking the data records ?

  The SAP error message KI502, which states "System error when locking the data records," typically occurs in the context of CO (Controlling) module transactions. This error indicates that there is an issue with the system's ability to lock the necessary data records for processing, which can prevent users from completing their transactions.
  Causes of KI502 Error
  
  
  Database Lock Issues: The error may arise due to problems with database locks. If a record is already locked by another user or process, the system cannot lock it for the current transaction.
  
  
  System Performance Issues: High system load or performance issues can lead to timeouts or failures in locking mechanisms.
  
  
  Configuration Issues: Incorrect configuration in the CO module or related settings may lead to locking problems.
  
  
  Transport Issues: If there are recent transports that have not been properly executed or have errors, they may cause inconsistencies in the system.
  
  
  User Authorizations: Insufficient authorizations for the user trying to perform the action can also lead to locking issues.
  
  
  Solutions to KI502 Error
  
  
  Check for Existing Locks: Use transaction code SM12 to check for existing locks on the data records. If you find locks that are no longer needed, you can delete them (if you have the necessary authorizations).
  
  
  System Performance Monitoring: Monitor system performance using transaction codes like ST22 (dump analysis) and SM21 (system log) to identify any underlying issues that may be affecting locking.
  
  
  Review Configuration: Ensure that the configuration settings in the CO module are correct. This may involve checking settings related to cost centers, internal orders, or other relevant areas.
  
  
  Transport Management: If the error occurred after a transport, check the transport logs for errors and ensure that all necessary transports have been executed correctly.
  
  
  User Authorizations: Verify that the user has the necessary authorizations to perform the action. This may involve checking roles and profiles assigned to the user.
  
  
  Restart the Transaction: Sometimes, simply restarting the transaction or logging out and back into the system can resolve temporary locking issues.
  
  
  Contact SAP Support: If the issue persists after trying the above solutions, it may be necessary to contact SAP support for further assistance, especially if it appears to be a system-wide issue.
  
  
  Related Information
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (lock entries), SM21 (system log), ST22 (dump analysis), and SU53 (authorization check).
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  System Logs: Review system logs for any additional error messages or warnings that may provide context for the locking issue.
  
  By following these steps, you should be able to diagnose and resolve the KI502 error in SAP.