How To Fix /SAPAPO/ATPLOG_PAL090 - Characteristics combinations could not be (completely) locked

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/ATPLOG_PAL -

• Message number: 090

• Message text: Characteristics combinations could not be (completely) locked

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/ATPLOG_PAL090 - Characteristics combinations could not be (completely) locked ?

  The SAP error message /SAPAPO/ATPLOG_PAL090 indicates that there was an issue with locking characteristic combinations in the Advanced Planning and Optimization (APO) module, specifically in the context of Available-to-Promise (ATP) checks. This error typically arises when the system is unable to lock certain characteristic combinations that are necessary for processing ATP checks, which can lead to inconsistencies or conflicts in data handling.
  Causes:
  
  Concurrency Issues: Multiple processes or users may be trying to access or modify the same characteristic combinations simultaneously, leading to a locking conflict.
  Long-Running Transactions: If a transaction takes too long to complete, it may hold locks longer than expected, preventing other transactions from acquiring the necessary locks.
  Configuration Issues: Incorrect configuration of the APO system or the specific planning area may lead to locking problems.
  Database Locking: Database-level locks may be preventing the application from acquiring the necessary locks on the characteristic combinations.
  System Performance: High system load or performance issues can exacerbate locking problems.
  
  Solutions:
  
  Check for Active Sessions: Use transaction codes like SM12 (to check for locks) and SM21 (to check system logs) to identify any active sessions that may be holding locks on the characteristic combinations.
  Optimize Long-Running Transactions: Review and optimize any long-running transactions that may be causing locks to persist longer than necessary.
  Adjust Lock Settings: If applicable, consider adjusting the lock settings in the configuration to allow for more flexible locking behavior.
  Increase System Resources: If the issue is related to system performance, consider increasing the resources available to the SAP system (e.g., CPU, memory).
  Review Configuration: Ensure that the configuration of the planning area and characteristic combinations is correct and aligns with best practices.
  Batch Processing: If applicable, consider using batch processing for transactions that require locking, to minimize the impact on concurrent users.
  Consult SAP Notes: Check for any relevant SAP Notes that may address known issues or provide patches related to this error.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SM12 (to view locks), SM21 (to view system logs), and ST22 (to check for dumps) for troubleshooting.
  SAP Support: If the issue persists, consider reaching out to SAP Support for assistance, providing them with detailed logs and error messages.
  Documentation: Review SAP documentation related to ATP and locking mechanisms in APO for further insights and best practices.
  
  By addressing the underlying causes and implementing the suggested solutions, you should be able to resolve the /SAPAPO/ATPLOG_PAL090 error and improve the locking behavior in your SAP APO environment.