How To Fix /ACCGO/CMGL_APPL012 - System locking error

SAP Error Message - Details

• Message type: E = Error

• Message class: /ACCGO/CMGL_APPL -

• Message number: 012

• Message text: System locking error

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

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 /ACCGO/CMGL_APPL012 - System locking error ?

  The SAP error message /ACCGO/CMGL_APPL012 typically indicates a system locking issue related to the application of a change or a transaction that is being processed. This error can occur in various scenarios, often when multiple users or processes are trying to access or modify the same data simultaneously, leading to a lock conflict.
  Cause:
  
  Concurrent Access: Multiple users or processes are trying to access the same resource or data at the same time, causing a lock.
  Long-Running Transactions: A transaction that takes a long time to complete may hold locks longer than expected, preventing other transactions from proceeding.
  Improper Lock Management: Issues with how locks are managed in the application or database can lead to conflicts.
  System Configuration: Configuration settings in the SAP system that dictate how locks are handled may not be optimal.
  
  Solution:
  
  Identify the Lock: Use transaction code SM12 to view and analyze the locks in the system. You can check which user or process is holding the lock.
  Release the Lock: If you identify a lock that is no longer needed, you can manually release it from the SM12 transaction. Be cautious when doing this, as it may affect other users or processes.
  Optimize Transactions: Review the transactions that are causing locks and optimize them to reduce their execution time. This may involve improving performance or breaking down large transactions into smaller ones.
  Review Lock Settings: Check the configuration settings related to locking in your SAP system. Adjusting these settings may help reduce lock contention.
  Implement Retry Logic: If the error occurs due to temporary lock contention, implementing a retry mechanism in your application logic can help mitigate the issue.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide guidance on best practices for lock management.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (for lock entries), SM21 (for system logs), and ST22 (for dumps) to diagnose issues.
  Performance Monitoring: Use tools like ST03N to monitor system performance and identify long-running transactions that may be causing locks.
  SAP Community: Engage with the SAP Community or forums for insights from other users who may have encountered similar issues.
  
  If the problem persists after trying the above solutions, it may be beneficial to involve your SAP Basis team or consult with SAP support for further assistance.