How To Fix /STTPEC/WHS_MSG020 - Parent UoM should not be the same as Child UoM.

SAP Error Message - Details

• Message type: E = Error

• Message class: /STTPEC/WHS_MSG -

• Message number: 020

• Message text: Parent UoM should not be the same as Child UoM.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /STTPEC/WHS_MSG020 - Parent UoM should not be the same as Child UoM. ?

  The SAP error message /STTPEC/WHS_MSG020 indicates that there is a mismatch in the unit of measure (UoM) configuration between a parent and child item in a hierarchical structure, such as a bill of materials (BOM) or a product structure. Specifically, this error occurs when the parent unit of measure is the same as the child unit of measure, which is not allowed in the system.
  Cause:
  
  Configuration Error: The parent and child items are configured with the same unit of measure in the material master or BOM.
  Data Entry Mistake: During the creation or modification of the BOM or product structure, the same UoM was inadvertently assigned to both the parent and child items.
  Inconsistent Master Data: The material master data for the parent and child items may not be set up correctly, leading to this conflict.
  
  Solution:
  
  
  Check Material Master Data:
  
  Go to the material master records for both the parent and child items.
  Verify the unit of measure settings. Ensure that the parent and child items have different units of measure.
  
  
  
  Modify BOM or Product Structure:
  
  If you are working with a BOM, check the BOM structure in transaction CS02 (Change BOM) or CS03 (Display BOM).
  Ensure that the UoM for the parent item is different from that of the child item. If they are the same, change the UoM for one of the items.
  
  
  
  Review UoM Settings:
  
  Check the UoM settings in the configuration (transaction OMN1 for UoM conversion) to ensure that the UoM definitions are correct and that there are no conflicts.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources for further guidance on UoM configurations and restrictions.
  
  
  
  Testing:
  
  After making the necessary changes, test the process again to ensure that the error does not reoccur.
  
  
  
  Related Information:
  
  Unit of Measure (UoM): In SAP, UoM is a critical aspect of material management, affecting inventory management, procurement, and sales processes.
  BOM Structure: A BOM defines the components needed to produce a product, and each component can have its own UoM.
  Material Master: The material master is a central repository of information about materials in SAP, including UoM settings.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in material management for further assistance.