How To Fix WN464 - Existing BP &1 with customer &2 will be assigned; maintain supplier

WN464 - Overview

• Message type: E = Error

• Message class: WN - Plant master data maintenance (integrated)

• Message number: 464

• Message text: Existing BP &1 with customer &2 will be assigned; maintain supplier

What causes this issue?

You are creating a plant and need to assign a business partner to the
plant.
The business partner you want to assign has the required customer, but
currently no supplier assigned.

System Response

It is not possible to assign a business partner without a supplier to a
plant if the plant profile of the plant requires a supplier.

How to fix this error?

Use the business partner maintenance to extend the business partner by a
supplier.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

WN464 - Details

• The SAP error message WN464 indicates that there is an issue with the Business Partner (BP) assignment in the system, specifically related to the customer and supplier roles. This error typically arises when you are trying to create or maintain a Business Partner that is already linked to an existing customer but does not have a corresponding supplier assignment.
  
  Cause:
  
  Existing Business Partner: The Business Partner (BP) already exists in the system with a customer role assigned to it.
  Missing Supplier Role: The same Business Partner does not have a supplier role assigned, which is required for the operation you are trying to perform.
  Data Inconsistency: There may be inconsistencies in the data where the system expects a supplier role to be present for the existing customer.
  
  
  Solution:
  To resolve the WN464 error, you can follow these steps:
  
  
  Check Existing Business Partner:
  
  Go to the Business Partner transaction (BP) in SAP.
  Search for the Business Partner ID mentioned in