How To Fix /SAPAPO/PPO_OPT150 - &1 stock interval were locked in another session hence they were skipped

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/PPO_OPT -

• Message number: 150

• Message text: &1 stock interval were locked in another session hence they were skipped

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/PPO_OPT150 - &1 stock interval were locked in another session hence they were skipped ?

  The SAP error message /SAPAPO/PPO_OPT150 &1 stock interval were locked in another session hence they were skipped typically occurs in the context of SAP Advanced Planning and Optimization (APO) when a planning run is trying to access stock intervals that are currently locked by another session. This can happen during planning runs, such as during the optimization of production or distribution plans.
  Cause:
  
  Concurrent Sessions: The error is primarily caused by multiple users or processes trying to access the same stock intervals simultaneously. When one session locks a stock interval for processing, other sessions cannot access it until the lock is released.
  Long-Running Processes: If a planning run takes a long time to complete, it can hold locks on stock intervals for an extended period, leading to this error for subsequent processes.
  System Configuration: Certain configurations in the APO system may lead to more frequent locking of stock intervals.
  
  Solution:
  
  Wait and Retry: If the error is due to a temporary lock, waiting for the other session to complete and then retrying the operation may resolve the issue.
  Identify and Terminate Locks: Use transaction codes like SM12 to identify and manage locks. You can check which user or process is holding the lock and, if necessary, terminate that session (with caution).
  Optimize Planning Runs: Review the planning runs to ensure they are optimized and not running longer than necessary. This may involve adjusting parameters or scheduling to reduce overlap.
  Batch Processing: If possible, schedule planning runs in a way that minimizes the chance of overlapping access to stock intervals.
  System Monitoring: Implement monitoring tools to keep track of long-running processes and locks, allowing for proactive management of sessions.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SM12 (to view and manage locks), SM21 (to check system logs), and ST22 (to analyze dumps) for troubleshooting.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions to common problems.
  Documentation: Review SAP documentation on APO planning processes and locking mechanisms to better understand how to manage and configure your system to minimize such issues.
  
  By following these steps, you should be able to address the error and reduce the likelihood of it occurring in the future.