How To Fix /SCWM/WHO420 - Queue for WT &1 was changed from &2 to &3 for warehouse order &4

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCWM/WHO -

• Message number: 420

• Message text: Queue for WT &1 was changed from &2 to &3 for warehouse order &4

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCWM/WHO420 - Queue for WT &1 was changed from &2 to &3 for warehouse order &4 ?

  The SAP error message /SCWM/WHO420 indicates that there has been a change in the queue for a Warehouse Task (WT) in the context of a Warehouse Order (WO). This message typically arises in the SAP Extended Warehouse Management (EWM) module when there is a discrepancy or an unexpected change in the queue assignment for a warehouse task.
  Cause:
  
  
  Queue Change: The error message indicates that the queue for the warehouse task has been changed from one value to another. This could happen due to:
  
  Manual intervention by a user or an automated process that modifies the queue assignment.
  System processes that reassign tasks based on certain conditions (e.g., resource availability, priority changes).
  Configuration settings that dictate how tasks are assigned to queues.
  
  
  
  Concurrency Issues: If multiple users or processes are trying to modify the same warehouse task or order simultaneously, it can lead to conflicts and changes that trigger this error.
  
  
  System Configuration: Incorrect or incomplete configuration of the warehouse management processes, including queue management settings, can lead to unexpected behavior.
  
  
  Solution:
  
  
  Review Queue Assignments: Check the queue assignments for the warehouse task in question. Ensure that the changes made are intentional and align with your warehouse management processes.
  
  
  Check for Concurrent Processes: Investigate if there are any concurrent processes or users that might be modifying the same warehouse task. If so, coordinate to avoid conflicts.
  
  
  System Logs: Review system logs and change documents to identify what caused the queue change. This can provide insights into whether it was a manual change or an automated process.
  
  
  Configuration Review: Ensure that the configuration for queue management and warehouse task processing is set up correctly. This includes checking the settings for task creation, queue assignment, and any relevant rules.
  
  
  Testing: If changes were made to the configuration or processes, conduct thorough testing to ensure that the issue does not recur.
  
  
  Consult Documentation: Refer to SAP documentation or notes related to the /SCWM/WHO420 message for any specific recommendations or known issues.
  
  
  Related Information:
  
  Transaction Codes: You may want to use transaction codes like /SCWM/PRDI (for warehouse order processing) or /SCWM/PRDI (for warehouse task processing) to monitor and manage warehouse tasks and orders.
  SAP Notes: Check SAP Notes for any updates or patches related to this error message, as SAP frequently releases notes that address known issues.
  Support: If the issue persists and cannot be resolved through the above steps, consider reaching out to SAP support for further assistance.
  
  By following these steps, you should be able to diagnose and resolve the issue related to the /SCWM/WHO420 error message effectively.