How To Fix MGVNUM020 - External material nuimber already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: MGVNUM - Messages for material versions

• Message number: 020

• Message text: External material nuimber already exists

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message MGVNUM020 - External material nuimber already exists ?

  The SAP error message MGVNUM020 indicates that an external material number you are trying to use already exists in the system. This typically occurs when you are attempting to create or update a material master record with an external number that is already assigned to another material.
  Cause:
  
  Duplicate External Material Number: The external material number you are trying to assign is already in use for another material in the system.
  Incorrect Data Entry: There may have been a typographical error or misunderstanding regarding the external material number.
  Data Migration Issues: If you are migrating data from another system, there may be conflicts with existing material numbers in SAP.
  
  Solution:
  
  
  Check Existing Material Numbers:
  
  Use transaction code MM03 (Display Material) to search for the existing material using the external number you are trying to use. This will help you confirm if the number is indeed in use.
  
  
  
  Use a Different External Number:
  
  If the external number is already in use, you will need to choose a different external material number that is not currently assigned to any material.
  
  
  
  Review Material Master Data:
  
  If you believe the external number should not be in use, review the material master data to ensure there are no duplicates or errors.
  
  
  
  Data Migration Review:
  
  If this error occurred during a data migration process, review the migration data to ensure that there are no conflicts with existing records in SAP.
  
  
  
  Consult with Your SAP Administrator:
  
  If you are unable to resolve the issue, consult with your SAP administrator or support team. They may have access to additional tools or logs that can help diagnose the problem.
  
  
  
  Related Information:
  
  Transaction Codes:
  
  MM01: Create Material
  MM02: Change Material
  MM03: Display Material
  MMR1: Maintain Material Master Data
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to material number handling.
  Documentation: Review SAP documentation on material master data management for best practices and guidelines.
  
  By following these steps, you should be able to resolve the MGVNUM020 error and successfully manage your material numbers in SAP.