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

IUID104 - Overview

• 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