How To Fix WY149 - External manufacturer number &1 is not unique

SAP Error Message - Details

• Message type: E = Error

• Message class: WY - Supplier Master

• Message number: 149

• Message text: External manufacturer number &1 is not unique

What causes this issue?

There are at least two vendor master records for external manufacturer
number &V1&.

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?

Please check your external manufacturer number.

Error message extract from SAP system. Copyright SAP SE.

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• What is the cause and solution for SAP error message WY149 - External manufacturer number &1 is not unique ?

  SAP Error Message:
  
  WY149 - External manufacturer number &1 is not unique
  
  Cause:
  This error occurs when you try to create or maintain a manufacturer master record (or related data) with an external manufacturer number that already exists in the system. The external manufacturer number is supposed to be unique to identify a manufacturer uniquely. If the system finds that the number you are trying to enter is already assigned to another manufacturer, it throws this error.
  
  Explanation:
  
  The external manufacturer number is often used for integration or reference purposes, linking SAP data with external systems or documents.
  SAP enforces uniqueness to avoid confusion or data inconsistency.
  The error message WY149 indicates a duplicate entry attempt for the external manufacturer number.
  
  
  Solution:
  
  
  Check Existing Records:
  
  Use transaction MM03 (Display Material) or BP (Business Partner) or the relevant transaction where manufacturer data is maintained.
  Search for the external manufacturer number to identify the existing manufacturer record that already uses this number.
  
  
  
  Correct the External Manufacturer Number:
  
  If you are creating a new manufacturer, assign a unique external manufacturer number that is not already in use.
  If you are updating an existing manufacturer, ensure you are not duplicating the external number.
  
  
  
  Data Cleanup:
  
  If duplicate entries exist due to data inconsistencies, coordinate with your master data team to clean up duplicates.
  Possibly merge or delete redundant manufacturer records.
  
  
  
  Check Customizing:
  
  Sometimes, the uniqueness check is controlled by customizing settings or user exits. Verify if any custom logic is enforcing uniqueness and adjust if necessary.
  
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  MM01/MM02/MM03 – Material Master (if manufacturer data is maintained here)
  BP – Business Partner (if manufacturers are maintained as business partners)
  SPRO – Customizing for vendor/manufacturer master data
  
  
  
  Tables:
  
  Manufacturer master data might be stored in tables like T024 (Purchasing Groups), LFA1 (Vendor Master), or custom tables depending on your SAP setup.
  The external manufacturer number field might be a custom field or standard field depending on your SAP version and configuration.
  
  
  
  Notes and Documentation:
  
  Check SAP Notes related to manufacturer master data and external number uniqueness.
  Review your SAP system documentation for manufacturer master data management.
  
  
  
  
  Summary:
  
  Cause: Duplicate external manufacturer number entered.
  Solution: Use a unique external manufacturer number; check existing records and correct duplicates.
  Check: Existing master data, customizing, and possibly clean up duplicates.
  
  
  If you provide the exact transaction or process where this error occurs, I can give more tailored advice.