How To Fix IUID121 - Parent UII and UII are identical; parent UII must be different to UII

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 121

• Message text: Parent UII and UII are identical; parent UII must be different to UII

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message IUID121 - Parent UII and UII are identical; parent UII must be different to UII ?

  The SAP error message IUID121 indicates that there is an issue with the Unique Item Identifier (UII) in the context of the Integrated Unique Item Identifier (IUID) functionality. Specifically, this error occurs when the parent UII and the child UII are identical, which is not allowed. The parent UII must be different from the child UII to maintain the integrity of the hierarchical relationship between items.
  Cause:
  The error arises when:
  
  You are trying to create or update an item in the IUID system where the parent UII is the same as the child UII.
  This typically happens during the creation of a new item or when associating a child item with a parent item in the IUID hierarchy.
  
  Solution:
  To resolve the IUID121 error, you should:
  
  Check the UII Values: Verify the UII values you are using for both the parent and child items. Ensure that they are distinct and that the parent UII is not the same as the child UII.
  Correct the Data Entry: If you find that the UII values are indeed identical, modify the child UII to ensure it is unique and different from the parent UII.
  Review Hierarchical Structure: If you are working with a complex hierarchy, review the structure to ensure that all parent-child relationships are correctly defined and that no duplicates exist.
  Consult Documentation: If you are unsure about the correct UII values or the structure, refer to the SAP documentation or guidelines related to IUID management for further clarification.
  
  Related Information:
  
  IUID Functionality: The IUID functionality in SAP is used for tracking and managing unique items, especially in industries where item traceability is critical (e.g., defense, aerospace).
  Data Validation: Always ensure that data entered into the system adheres to the required formats and uniqueness constraints to avoid similar errors.
  SAP Support: If the issue persists after checking the UII values, consider reaching out to SAP support or your internal SAP team for further assistance.
  
  By following these steps, you should be able to resolve the IUID121 error and successfully manage your IUID entries in SAP.