How To Fix MPN01052 - External manufacturer &1 has been used in &2 manufacturer part number(s)

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 052

• Message text: External manufacturer &1 has been used in &2 manufacturer part number(s)

What causes this issue?

You have changed the external manufacturer code, but MPN-MRP conversion
of material numbers is not active in your system. The system therefore
displays manufacturer parts instead of material numbers on screens and
lists. The external manufacturer might also be displayed. The external
manufacturer &V1& has been used in &V2& manufacturer part numbers in
your system, which means that these numbers cannot be correct.

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?

You can save your data and execute transaction <DS:TRAN.MPN01>MPN01</>
with a new external manufacturer in order to correct the relevant
manufacturer part numbers.

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 MPN01052 - External manufacturer &1 has been used in &2 manufacturer part number(s) ?

  The SAP error message MPN01052 indicates that there is an issue related to the use of an external manufacturer in the context of manufacturer part numbers (MPNs). Specifically, the message states that an external manufacturer (identified by &1) has been used in the manufacturer part number(s) associated with a specific material or item (identified by &2).
  Cause:
  The error typically arises due to one of the following reasons:
  
  Incorrect Configuration: The external manufacturer may not be properly configured in the system, or there may be inconsistencies in the data related to the manufacturer part numbers.
  Data Integrity Issues: There may be issues with the data integrity, such as missing or incorrect entries in the manufacturer part number records.
  Usage of External Manufacturer: The system may not allow the use of external manufacturers in certain contexts, or there may be restrictions based on the configuration of the material master or vendor master data.
  
  Solution:
  To resolve the MPN01052 error, you can take the following steps:
  
  
  Check Manufacturer Configuration:
  
  Verify that the external manufacturer (identified by &1) is correctly set up in the system. This includes checking the manufacturer master data and ensuring that all required fields are filled out correctly.
  
  
  
  Review Manufacturer Part Numbers:
  
  Check the manufacturer part numbers associated with the material (identified by &2). Ensure that they are correctly linked to the external manufacturer and that there are no discrepancies.
  
  
  
  Data Consistency:
  
  Run data consistency checks to identify any issues with the manufacturer part number records. You may need to correct any inconsistencies found.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources related to manufacturer part numbers and external manufacturers to understand any specific requirements or restrictions.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the above points, consider reaching out to SAP support for further assistance. They may provide insights specific to your system configuration or version.
  
  
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes such as MM03 (Display Material), MM02 (Change Material), or MPN1 (Maintain Manufacturer Part Numbers) to investigate and resolve the issue.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on handling external manufacturers and MPNs.
  User Roles and Authorizations: Ensure that you have the necessary authorizations to make changes to manufacturer data and part numbers.
  
  By following these steps, you should be able to identify the root cause of the MPN01052 error and implement the necessary solutions to resolve it.