How To Fix WN229 - Material & already exists as an exception

WN229 - Overview

• Message type: E = Error

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

• Message number: 229

• Message text: Material & already exists as an exception

What causes this issue?

The material has already been specified as an exception from
inventory management for material group assignment.

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.

WN229 - Details

• The SAP error message WN229 indicates that a material already exists as an exception in the system. This typically occurs in the context of material management or inventory management processes, where the system is trying to create or modify a material that has already been flagged as an exception.
  
  Cause:
  
  Duplicate Material Entry: The material you are trying to create or modify already exists in the system, possibly with a different status or configuration.
  Material Status: The material may have been flagged for some reason (e.g., blocked, obsolete, etc.) which prevents further processing.
  Data Inconsistency: There may be inconsistencies in the data that lead the system to believe that the material is an exception.
  
  
  Solution:
  
  Check Existing Material: Verify if the material number you are trying to use already exists in the system. You can do this by using transaction codes like MM03 (Display Material) to check the material's status and details.
  Review Material Status: If the