How To Fix /SCWM/HU_WM171 - Change in base unit of measure for quantity possible is not permitted

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCWM/HU_WM -

• Message number: 171

• Message text: Change in base unit of measure for quantity possible is not permitted

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCWM/HU_WM171 - Change in base unit of measure for quantity possible is not permitted ?

  The SAP error message /SCWM/HU_WM171 indicates that there is an issue with changing the base unit of measure (UoM) for a quantity in the context of handling units (HUs) in the Extended Warehouse Management (EWM) module. This error typically arises when there is an attempt to modify the UoM of a handling unit that is not allowed due to system constraints or configuration settings.
  Cause:
  
  Inconsistent UoM Settings: The base unit of measure for the material may be set in a way that does not allow changes. For example, if the handling unit is already created with a specific UoM, changing it might violate the system's integrity rules.
  Stock Type Restrictions: The stock type (e.g., unrestricted, blocked) may have restrictions on changing the UoM.
  Configuration Settings: The system configuration may not allow changes to the UoM for certain materials or handling units.
  Open Transactions: There may be open transactions or processes that are dependent on the current UoM, preventing changes.
  
  Solution:
  
  Check Material Master Data: Review the material master data to ensure that the base unit of measure is correctly defined and that it aligns with the handling unit's UoM.
  Review Handling Unit: Check the handling unit's details to confirm that it is in a state that allows for changes. If the HU is already processed or in use, you may need to create a new HU instead.
  Configuration Review: Consult with your SAP configuration team to review the settings related to UoM changes in the EWM module. Ensure that the system is configured to allow changes where necessary.
  Transaction Status: Ensure that there are no open transactions or processes that are preventing the change. If there are, you may need to complete or cancel those transactions first.
  Use Alternative Methods: If changing the UoM is not possible, consider using alternative methods such as creating a new handling unit with the desired UoM and transferring the stock accordingly.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on handling UoM changes in EWM.
  Documentation: Refer to the SAP EWM documentation for detailed information on handling units and unit of measure management.
  Support: If the issue persists, consider reaching out to SAP support for assistance, providing them with the error message details and the context in which it occurs.
  
  By following these steps, you should be able to identify the root cause of the error and implement a suitable solution.