How To Fix /SCMB/LSO120 - No free slot for optimizer execution found

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCMB/LSO -

• Message number: 120

• Message text: No free slot for optimizer execution found

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCMB/LSO120 - No free slot for optimizer execution found ?

  The SAP error message /SCMB/LSO120 No free slot for optimizer execution found typically occurs in the context of the SAP Advanced Planning and Optimization (APO) module, particularly when dealing with the Supply Chain Management (SCM) functionalities. This error indicates that the system is unable to find an available slot for executing the optimizer, which is responsible for planning and scheduling tasks.
  Causes:
  
  Resource Limitation: The system may have reached its limit on the number of concurrent optimizer executions. This can happen if multiple optimization runs are initiated simultaneously.
  Configuration Issues: The configuration settings for the optimizer may not be set up correctly, leading to resource allocation issues.
  Long-Running Processes: If there are long-running optimization processes that have not completed, they may be occupying the available slots.
  System Performance: High system load or performance issues can also lead to this error, as the system may not be able to allocate resources effectively.
  
  Solutions:
  
  Check Running Processes: Use transaction codes like SM37 to check for any long-running or stuck optimization jobs. If you find any, consider terminating them if they are no longer needed.
  Increase Slots: If your system configuration allows, consider increasing the number of slots available for optimizer execution. This can typically be done in the configuration settings of the APO system.
  Schedule Jobs Appropriately: If multiple optimization jobs are being scheduled, try to stagger them to avoid overloading the system.
  System Performance Tuning: Review system performance and resource allocation. Ensure that the system has adequate resources (CPU, memory) to handle the optimization tasks.
  Check Configuration: Review the configuration settings for the optimizer in the SAP system to ensure they are set correctly. This may involve checking the settings in the APO system configuration.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM37 (Job Monitoring), SM50 (Process Overview), and SCMB/LSO (Logistics Service Optimization).
  SAP Documentation: Refer to the official SAP documentation for detailed information on configuring and managing the optimizer in the SCM module.
  SAP Community: Engage with the SAP Community forums for insights and solutions shared by other users who may have encountered similar issues.
  
  If the problem persists after trying the above solutions, it may be beneficial to reach out to SAP support for further assistance.