How To Fix /SCWM/RF_EN420 - Handling unit &1 already exists in the warehouse

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCWM/RF_EN -

• Message number: 420

• Message text: Handling unit &1 already exists in the warehouse

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCWM/RF_EN420 - Handling unit &1 already exists in the warehouse ?

  The SAP error message /SCWM/RF_EN420 Handling unit &1 already exists in the warehouse typically occurs in the context of SAP Extended Warehouse Management (EWM) when you are trying to create or process a handling unit (HU) that already exists in the system. This can happen during various operations, such as receiving goods, transferring stock, or performing inventory counts.
  Cause:
  
  
  Duplicate Handling Unit: The handling unit you are trying to create or process already exists in the warehouse. This could be due to:
  
  An attempt to create a new handling unit with the same identifier as an existing one.
  A previous operation that did not complete successfully, leaving the handling unit in an inconsistent state.
  Manual entry errors where the same HU number is reused.
  
  
  
  System Configuration: There may be configuration settings in the system that enforce unique handling unit identifiers, leading to this error when duplicates are detected.
  
  
  Solution:
  
  
  Check Existing Handling Units: 
  
  Use transaction codes like /SCWM/HU or relevant reports to search for the handling unit in question. Verify if it indeed exists in the system.
  If the handling unit is found, determine if it is in a state that allows for the operation you are trying to perform.
  
  
  
  Use a Different Handling Unit: If the handling unit already exists and is valid, consider using a different HU number for your operation.
  
  
  Resolve Inconsistencies: If you suspect that the handling unit is in an inconsistent state:
  
  Check for any open or incomplete processes related to that handling unit.
  If necessary, consult with your warehouse management team or SAP support to resolve any inconsistencies.
  
  
  
  Review Configuration: If this error occurs frequently, review the configuration settings related to handling units in your SAP EWM system to ensure they align with your business processes.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for more detailed troubleshooting steps specific to your version of SAP EWM.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes in SAP EWM, such as /SCWM/HU for handling unit management.
  SAP Notes: Check SAP Notes for any known issues or patches related to handling units in your version of SAP EWM.
  User Training: Ensure that users are trained on the proper handling unit processes to minimize the risk of duplicate entries.
  
  If the issue persists after following these steps, it may be beneficial to engage with SAP support for further assistance.