How To Fix /SAPAPO/ATP104 - System error occurred when locking (&2)

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/ATP -

• Message number: 104

• Message text: System error occurred when locking (&2)

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 /SAPAPO/ATP104 - System error occurred when locking (&2) ?

  The SAP error message /SAPAPO/ATP104 System error occurred when locking (&2) typically occurs in the context of Advanced Planning and Optimization (APO) when there is an issue with locking mechanisms in the system. This error can arise due to various reasons, including database locks, system inconsistencies, or issues with the application logic.
  Causes:
  
  Database Lock Issues: The system may be trying to lock a resource that is already locked by another process or transaction.
  Concurrency Problems: Multiple users or processes may be trying to access or modify the same data simultaneously, leading to conflicts.
  System Performance Issues: High load on the system can lead to timeouts or failures in acquiring locks.
  Configuration Issues: Incorrect configuration settings in the APO system can lead to locking problems.
  Transport Issues: If there have been recent transports or changes in the system, they may have introduced inconsistencies.
  
  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 errors or warnings that could provide more context about the issue.
  Analyze Performance: Use transaction ST22 to check for dumps that may indicate performance issues or other underlying problems.
  Adjust Configuration: Review the configuration settings in the APO system to ensure they are set up correctly for your business processes.
  Increase System Resources: If the system is under heavy load, consider increasing the resources (CPU, memory) allocated to the SAP system.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide patches.
  Restart Processes: If the issue persists, consider restarting the relevant background jobs or processes that may be causing the locking issue.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (Lock Entries), SM21 (System Log), ST22 (Dump Analysis), and SLG1 (Application Log).
  SAP Support: If the issue cannot be resolved internally, consider reaching out to SAP Support for assistance, providing them with detailed information about the error and the context in which it occurred.
  Documentation: Review the official SAP documentation for APO and ATP to understand the locking mechanisms and best practices for managing them.
  
  By following these steps, you should be able to diagnose and resolve the /SAPAPO/ATP104 error effectively.