How To Fix WN503 - Supplier &1 not maintained

WN503 - Overview

• Message type: E = Error

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

• Message number: 503

• Message text: Supplier &1 not maintained

What causes this issue?

A vendor who has not been created in the system 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.

WN503 - Details

• The SAP error message WN503 "Supplier &1 not maintained" typically occurs in the context of procurement or inventory management when the system cannot find the supplier (vendor) information for a specific material or purchasing document. This error can arise in various scenarios, such as when trying to create a purchase order, a purchase requisition, or when processing goods receipts.
  
  Cause:
  
  Missing Vendor Master Data: The vendor (supplier) has not been created or maintained in the system for the specific purchasing organization or company code.
  Incorrect Vendor Assignment: The vendor may not be assigned to the material or may not be valid for the specific purchasing organization.
  Data Inconsistency: There may be inconsistencies in the vendor master data, such as missing or incorrect information.
  Inactive Vendor: The vendor may be marked as inactive or blocked in the system.
  
  
  Solution:
  
  
  Check Vendor Master Data:
  
  Go to the transaction code XK03 (Display Vendor) or MK03 (Display Vendor for Purchasing) to check