How To Fix MPN01011 - The combination MPN & and Manufacturer & is not unique

SAP Error Message - Details

• Message type: E = Error

• Message class: MPN01 - MPN Message: Material Master / customizing

• Message number: 011

• Message text: The combination MPN & and Manufacturer & is not unique

What causes this issue?

At least one material master already exists in which the same
combination of MPN and external manufacturer appears.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Via F4 help determine the corresponding material master record and
change the fields MPN and external manufacturer. If any other material
is marked for deletion, material reorganization must be carried out or
the fields MPN and external manufacturer must be changed in the
material marked for deletion, before this combination can be used
again.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MPN01011 - The combination MPN & and Manufacturer & is not unique ?

  The SAP error message MPN01011 indicates that there is a problem with the uniqueness of the combination of Manufacturer Part Number (MPN) and Manufacturer in the system. This typically occurs when you are trying to create or update a material master record, and the system finds that the specified MPN and Manufacturer combination already exists in the database.
  Cause:
  
  Duplicate Entries: The most common cause of this error is that there are already existing entries in the system for the same Manufacturer and MPN combination. This could happen if the data was entered previously or if there are multiple records that were not properly managed.
  Incorrect Data Entry: Sometimes, the error can arise from typographical errors or inconsistencies in how the MPN or Manufacturer is entered (e.g., extra spaces, different casing).
  Configuration Issues: There may be configuration settings in the SAP system that enforce uniqueness for MPN and Manufacturer combinations, leading to this error when the uniqueness constraint is violated.
  
  Solution:
  
  
  Check Existing Records: 
  
  Use transaction codes like MM03 (Display Material) or MM02 (Change Material) to check if the MPN and Manufacturer combination already exists in the system.
  You can also use transaction SE16 or SE16N to query the relevant database tables (like MARA, MARC, or MPN) to see if there are duplicates.
  
  
  
  Correct Data Entry: 
  
  Ensure that the MPN and Manufacturer are entered correctly without any typographical errors. Check for leading or trailing spaces and ensure consistent casing.
  
  
  
  Modify or Delete Duplicates: 
  
  If you find duplicate entries, you may need to modify or delete the unnecessary records to resolve the conflict. Ensure that you have the necessary authorizations to make these changes.
  
  
  
  Consult with Your SAP Administrator: 
  
  If you are unsure about how to proceed or if the duplicates are necessary for business reasons, consult with your SAP administrator or a functional consultant. They can provide guidance on how to handle the situation based on your organization's policies.
  
  
  
  Review Configuration Settings: 
  
  If this issue occurs frequently, it may be worth reviewing the configuration settings related to MPN and Manufacturer in your SAP system to ensure they align with your business processes.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to MPN handling in your version of SAP.
  Documentation: Review SAP documentation regarding material master data management and MPN handling for best practices.
  Training: Consider training for users who handle material master data to minimize data entry errors.
  
  By following these steps, you should be able to resolve the MPN01011 error and ensure that your MPN and Manufacturer combinations are unique in the SAP system.