How To Fix WN656 - Plant &1 is identical in the source system and target system

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 656

• Message text: Plant &1 is identical in the source system and target system

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WN656 - Plant &1 is identical in the source system and target system ?

  The SAP error message WN656 indicates that there is a conflict between the source and target systems during a data transfer or migration process. Specifically, it means that the plant (identified by &1) exists in both the source and target systems, which can lead to issues when trying to replicate or transfer data.
  Cause:
  
  Duplicate Plant Entries: The plant you are trying to transfer already exists in the target system with the same identifier.
  Data Migration: During data migration or system copy, the same plant may have been created in both systems, leading to a conflict.
  Configuration Issues: There may be configuration settings that allow for the same plant to be created in both systems inadvertently.
  
  Solution:
  
  Check Existing Plants: Verify the list of plants in both the source and target systems. You can do this by using transaction codes like OX10 (for plant maintenance) to see if the plant already exists in the target system.
  Rename or Delete: If the plant in the target system is not needed, consider deleting it or renaming it to avoid the conflict. Ensure that this action does not affect any existing processes or data.
  Adjust Migration Strategy: If you are migrating data, adjust your migration strategy to handle existing plants. This may involve excluding certain plants from the migration or updating them instead of creating new entries.
  Consult Documentation: Review SAP documentation or notes related to data migration and plant management for specific guidelines on handling such conflicts.
  Use Transaction Codes: Utilize transaction codes like SE11 (Data Dictionary) or SE16 (Data Browser) to investigate the database tables related to plants and understand the existing entries.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might provide additional insights or solutions for this specific error message.
  Data Migration Tools: If you are using tools like SAP Data Services or SAP S/4HANA Migration Cockpit, refer to their documentation for handling duplicate entries.
  Support: If the issue persists, consider reaching out to SAP support for assistance, especially if this is part of a larger migration or upgrade project.
  
  By following these steps, you should be able to resolve the WN656 error and successfully manage the plant data in your SAP systems.