How To Fix IO406 - Character string &1 is a special direct successor of &2

SAP Error Message - Details

• Message type: E = Error

• Message class: IO - Plant Maintenance: Object List

• Message number: 406

• Message text: Character string &1 is a special direct successor of &2

What causes this issue?

Program error

System Response

The system does not allow further processing.

How to fix this error?

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.

Smart SAP Assistant

• What is the cause and solution for SAP error message IO406 - Character string &1 is a special direct successor of &2 ?

  The SAP error message IO406 indicates that there is an issue with the character string being processed in relation to a hierarchy or structure in the system. Specifically, it suggests that the character string (often a cost center, internal order, or similar entity) is being treated as a special direct successor of another entity, which may not be valid in the context of the operation being performed.
  Cause:
  
  Hierarchy Structure Issues: The error often arises when there is a problem with the hierarchy structure in the system. For example, if you are trying to assign a cost center or internal order that is not correctly defined in the hierarchy.
  Data Integrity Issues: There may be inconsistencies in the data, such as missing or incorrect relationships between entities.
  Configuration Errors: Incorrect configuration settings in the controlling area or organizational structure can lead to this error.
  
  Solution:
  
  Check Hierarchy Structure: Review the hierarchy structure in the system to ensure that the character string (e.g., cost center or internal order) is correctly defined and that it has the appropriate parent-child relationships.
  Validate Data: Use transaction codes like KAH1 (for cost centers) or KO01 (for internal orders) to check the definitions and relationships of the entities involved. Ensure that all required fields are filled out correctly.
  Review Configuration: Check the configuration settings in the controlling area to ensure that they are set up correctly. This may involve reviewing the settings in transaction codes like OKEQ (for controlling area settings).
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on the error message and its implications.
  Seek Support: If the issue persists, consider reaching out to your SAP support team or consulting with an SAP expert who can provide more tailored assistance based on your specific system configuration and data.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as KAH1, KAH2, KO01, KO02, and OKEQ for managing cost centers and internal orders.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions to common problems.
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to identify the root cause of the IO406 error and implement a solution to resolve it.