How To Fix /AIF/ENGINE_PERSIST002 - Data message &1 could not be locked (line no. &2)

SAP Error Message - Details

• Message type: E = Error

• Message class: /AIF/ENGINE_PERSIST -

• Message number: 002

• Message text: Data message &1 could not be locked (line no. &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 /AIF/ENGINE_PERSIST002 - Data message &1 could not be locked (line no. &2) ?

  The SAP error message /AIF/ENGINE_PERSIST002 Data message &1 could not be locked (line no. &2) typically occurs in the context of the Application Interface Framework (AIF) when there is an attempt to lock a data message for processing, but the lock cannot be acquired. This can happen for several reasons, including:
  Causes:
  
  Concurrent Processing: Another process or user might already be processing the same message, leading to a lock conflict.
  Database Locking Issues: There may be issues with database locks, where the database is unable to grant a lock due to existing locks on the same data.
  Long-Running Transactions: If a transaction is taking too long to complete, it may hold locks longer than expected, preventing other processes from acquiring the necessary locks.
  Configuration Issues: There may be configuration settings in AIF that are not set correctly, leading to locking issues.
  
  Solutions:
  
  Check for Concurrent Processes: Investigate if there are other processes or users that are currently processing the same message. You can use transaction codes like SM12 (to check for locks) and SM21 (to check the system log) to identify any conflicts.
  Retry Mechanism: Implement a retry mechanism in your processing logic. If a lock cannot be acquired, wait for a short period and then attempt to lock the message again.
  Optimize Long-Running Transactions: Review and optimize any long-running transactions that may be holding locks for extended periods. This may involve performance tuning or breaking down large transactions into smaller ones.
  Review AIF Configuration: Check the configuration settings in AIF to ensure that they are set up correctly for your use case. This includes reviewing the settings for message processing and locking behavior.
  Database Administration: If the issue persists, consult with your database administrator to check for any underlying database issues that may be causing locking problems.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (to view locks), SM21 (system log), and SLG1 (application log) to help diagnose the issue.
  SAP Notes: Check SAP Notes for any known issues or patches related to AIF and locking mechanisms. This can provide insights into specific bugs or recommended fixes.
  Documentation: Review the official SAP documentation for AIF to understand the locking mechanisms and best practices for message processing.
  
  By following these steps, you should be able to identify the cause of the locking issue and implement a suitable solution.