How To Fix CH021 - BOM "&" contains component "&" more than once as item "&" category "&"

SAP Error Message - Details

• Message type: E = Error

• Message class: CH - CAD/PP integration messages

• Message number: 021

• Message text: BOM "&" contains component "&" more than once as item "&" category "&"

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.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CH021 - BOM "&" contains component "&" more than once as item "&" category "&" ?

  The SAP error message CH021 indicates that there is a problem with a Bill of Materials (BOM) where a specific component is listed more than once for a given item. This can lead to confusion in production planning and inventory management, as SAP expects each component in a BOM to be unique for a specific item.
  Cause:
  The error occurs when:
  
  A component is accidentally added multiple times to the same BOM.
  There may be a mistake in the BOM creation or maintenance process.
  The BOM structure is not correctly defined, leading to duplicate entries.
  
  Solution:
  To resolve the CH021 error, you can follow these steps:
  
  
  Check the BOM: 
  
  Use transaction code CS03 (Display BOM) to view the BOM in question.
  Enter the material number and plant to display the BOM.
  
  
  
  Identify Duplicates:
  
  Look for the component that is listed more than once. The error message will specify the component and the item category.
  Ensure that each component is only listed once for the specific BOM.
  
  
  
  Remove Duplicates:
  
  If you find duplicate entries, you can use transaction code CS02 (Change BOM) to edit the BOM.
  Remove the duplicate component entry, ensuring that each component is unique.
  
  
  
  Save Changes: 
  
  After making the necessary changes, save the BOM.
  
  
  
  Recheck: 
  
  After saving, you can recheck the BOM using CS03 to ensure that the error has been resolved.
  
  
  
  Related Information:
  
  BOM Structure: A BOM defines the components required to produce a product. Each component should be unique to avoid confusion in production.
  Item Categories: Different item categories (like stock item, non-stock item, etc.) can affect how components are treated in the BOM. Ensure that the item categories are correctly assigned.
  Transaction Codes:
  
  CS01: Create BOM
  CS02: Change BOM
  CS03: Display BOM
  CS11: Display BOM for a specific component
  
  
  Documentation: Refer to SAP documentation or help files for more detailed information on BOM management and error handling.
  
  By following these steps, you should be able to resolve the CH021 error and ensure that your BOM is correctly structured.