How To Fix WN501 - Supplier &1 already assigned to plant &2

WN501 - Overview

• Message type: E = Error

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

• Message number: 501

• Message text: Supplier &1 already assigned to plant &2

What causes this issue?

A vendor, who is himself assigned to another plant, is assigned to the
plant.

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?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WN501 - Supplier &1 already assigned to plant &2 ?

  The SAP error message WN501 indicates that a supplier (vendor) is already assigned to a specific plant in the system. This error typically occurs when you attempt to assign a supplier to a plant that already has that supplier assigned.
  
  Cause:
  The primary cause of this error is that the supplier (vendor) you are trying to assign to a plant is already linked to that plant in the SAP system. This can happen if:
  
  The supplier was previously assigned to the plant and you are trying to reassign them.
  There is an attempt to create a duplicate assignment for the same supplier and plant combination.
  
  
  Solution:
  To resolve the WN501 error, you can take the following steps:
  
  
  Check Existing Assignments:
  
  Go to the relevant transaction (e.g., ME11 for creating a purchasing info record or ME01 for creating a vendor) and check if the supplier is already assigned to the plant.
  You can use transaction codes like ME03 (Display Purchasing