How To Fix /SCWM/DELIVERY495 - &1 handling units not processed due to locking errors.

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCWM/DELIVERY -

• Message number: 495

• Message text: &1 handling units not processed due to locking errors.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCWM/DELIVERY495 - &1 handling units not processed due to locking errors. ?

  The SAP error message /SCWM/DELIVERY495 indicates that certain handling units (HUs) could not be processed due to locking errors. This typically occurs in the context of warehouse management processes, particularly when multiple users or processes are trying to access or modify the same handling units simultaneously.
  Cause:
  
  Locking Mechanism: SAP uses a locking mechanism to prevent data inconsistencies. If one user or process is currently working on a handling unit, other users or processes trying to access the same HU will encounter a locking error.
  Long-running Transactions: If a transaction takes too long to complete, it can hold locks on HUs longer than expected, causing subsequent attempts to access those HUs to fail.
  Concurrent Processing: Multiple users or background jobs trying to process the same handling units at the same time can lead to locking conflicts.
  System Performance Issues: If the system is under heavy load, it may exacerbate locking issues.
  
  Solution:
  
  Wait and Retry: Often, simply waiting for a few moments and then retrying the operation can resolve the issue, as the lock may be released once the other transaction completes.
  Identify Locking Users: Use transaction code SM12 to check for active locks on the handling units. You can identify which user or process is holding the lock and take appropriate action.
  Optimize Transactions: Review and optimize long-running transactions to ensure they complete more quickly and release locks sooner.
  Batch Processing: If possible, schedule batch jobs during off-peak hours to minimize contention for resources.
  Lock Management: Consider implementing a more robust lock management strategy, such as using a different approach to handle concurrent processing of HUs.
  System Performance Tuning: If locking issues are frequent, it may be necessary to analyze and tune the overall performance of the SAP system.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (to view and manage locks), SM21 (to check system logs), and ST22 (to analyze dumps).
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide patches related to locking errors in the context of handling units.
  Documentation: Review SAP documentation related to warehouse management and handling units for best practices and guidelines on managing locks and concurrent processing.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP Basis team or open a support ticket with SAP for further assistance.