How To Fix IUID104 - Top-level UII is not unique in the hierarchy

SAP Error Message - Details

• Message type: E = Error

• Message class: IUID - Messages Class for Unique Item Identification

• Message number: 104

• Message text: Top-level UII is not unique in the hierarchy

What causes this issue?

You are trying to change, install, or dismantle a piece of equipment or
a functional location. This would result in one or more functional
location hierarchies without a unique top-level UII. Alternatively, one
of the functional location hierarchies involved does not have a unique
top-level UII, independent of your current actions.
A functional location hierarchy is consistent from an IUID point of view
if it has a unique top-level UII. Only UIIs with the "Sent" or
"Confirmed" status are taken into account when checking the uniqueness
of a top-level UII.

System Response

The system issues warning or error messages according to the consistency
check message type defined in Customizing for <LS>Logistics - General
</>under <LS>Item Unique Identification (IUID) -> Define UID Handling
</>.

How to fix this error?

Check your current actions and the functional location hierarchies
involved.

Procedure for System Administrators

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 IUID104 - Top-level UII is not unique in the hierarchy ?

  The SAP error message IUID104: Top-level UII is not unique in the hierarchy typically occurs in the context of managing Unique Item Identifiers (UIIs) in SAP, particularly when dealing with the serialization of materials or products. This error indicates that there is a conflict with the uniqueness of the top-level UII in the hierarchy of items.
  Cause:
  The error arises when the system detects that the top-level UII (Unique Item Identifier) is not unique within the specified hierarchy. This can happen due to several reasons:
  
  Duplicate Entries: There may be multiple entries in the system with the same top-level UII.
  Incorrect Hierarchy Structure: The hierarchy of items may not be correctly defined, leading to conflicts in UII assignment.
  Data Migration Issues: If data has been migrated from another system, it may have introduced duplicates or inconsistencies.
  Manual Entry Errors: Users may have manually entered the same UII for different items.
  
  Solution:
  To resolve the IUID104 error, you can take the following steps:
  
  
  Check for Duplicates:
  
  Use transaction codes like IUID or relevant reports to check for existing UIIs in the system.
  Identify any duplicate top-level UIIs and determine which entries are valid.
  
  
  
  Correct the Hierarchy:
  
  Review the hierarchy structure of the items involved. Ensure that each top-level UII is unique and correctly assigned.
  If necessary, restructure the hierarchy to eliminate conflicts.
  
  
  
  Data Cleanup:
  
  If duplicates are found, decide on a strategy to clean up the data. This may involve deleting or merging entries.
  Ensure that any changes made do not affect other dependent data or processes.
  
  
  
  Review Data Migration Processes:
  
  If the issue arose after a data migration, review the migration process to ensure that it correctly handled UIIs and did not introduce duplicates.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for specific guidelines on managing UIIs and hierarchies.
  
  
  
  Contact SAP Support:
  
  If the issue persists and you cannot identify the cause, consider reaching out to SAP support for assistance.
  
  
  
  Related Information:
  
  UII Management: Understanding how Unique Item Identifiers work in SAP is crucial. Familiarize yourself with the concepts of serialization and item hierarchy.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as IUID, MM03, MM02, and others that may help in managing materials and UIIs.
  SAP Notes: Check for any SAP Notes related to IUID errors, as they may provide additional insights or patches that could resolve the issue.
  
  By following these steps, you should be able to identify and resolve the cause of the IUID104 error in your SAP system.