How To Fix /SCWM/HUGENERAL135 - HU &1 is being processed in parallel. No access possible

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCWM/HUGENERAL -

• Message number: 135

• Message text: HU &1 is being processed in parallel. No access possible

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCWM/HUGENERAL135 - HU &1 is being processed in parallel. No access possible ?

  The SAP error message /SCWM/HUGENERAL135 indicates that a Handling Unit (HU) is currently being processed in parallel by another transaction or user, which prevents access to that HU for the current operation. This is a common issue in systems where multiple users or processes may attempt to access or modify the same data simultaneously.
  Cause:
  
  
  Concurrent Access: The most common cause of this error is that another user or process is currently working with the same Handling Unit. This could be due to:
  
  Another user is trying to perform an operation on the same HU.
  A background job or automated process is currently processing the HU.
  A previous transaction has not yet completed, leaving the HU in a locked state.
  
  
  
  System Locking Mechanism: SAP uses a locking mechanism to prevent data inconsistencies. When one transaction is working on a specific HU, it locks that HU for other transactions until the first one is completed.
  
  
  Solution:
  
  
  Wait and Retry: The simplest solution is to wait for a few moments and then retry the operation. If the other transaction completes, you should be able to access the HU.
  
  
  Identify the Lock: If the issue persists, you can check which user or process is holding the lock:
  
  Use transaction code SM12 to view and manage locks. You can filter by the user or the object type to find the specific lock on the HU.
  If you identify a user or process that is holding the lock unnecessarily, you can communicate with them to resolve the issue.
  
  
  
  Check Background Jobs: If a background job is processing the HU, you can check the job status using transaction code SM37. If the job is stuck or taking too long, you may need to investigate further.
  
  
  System Administration: If you are unable to resolve the issue through the above methods, you may need to involve your SAP Basis team or system administrator to investigate any potential system issues or deadlocks.
  
  
  Related Information:
  
  Handling Units (HUs): In SAP Extended Warehouse Management (EWM), HUs are used to manage and track inventory. Understanding how HUs work and their lifecycle can help in troubleshooting issues related to them.
  Lock Management: Familiarize yourself with SAP's locking mechanisms and how they work to prevent data inconsistencies. This knowledge can help you understand why certain errors occur and how to address them.
  Transaction Codes:
  
  SM12: To view and manage locks.
  SM37: To check the status of background jobs.
  SE11: To view the data dictionary and understand the structure of the HU table if needed.
  
  
  
  By following these steps, you should be able to resolve the error and continue with your operations in SAP.