How To Fix IUID018 - UII is set to external creation; internal creation of UIIs not possible

IUID018 - Overview

• Message type: E = Error

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

• Message number: 018

• Message text: UII is set to external creation; internal creation of UIIs not possible

What causes this issue?

In the master data, you have specified that UIIs for material &V1& in
plant &V2& are to be created externally.

System Response

Internal UII creation is therefore not possible.

How to fix this error?

Create UII externally or change your master data to specify that UIIs
are created internally using transaction <LS>Change Material</> (MM02).

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.

IUID018 - Details

• The SAP error message IUID018 indicates that the Unique Item Identifier (UII) is set to be created externally, which means that the system is not allowed to create UIIs internally. This typically occurs in the context of managing Unique Item Identifiers (UIIs) for serialized items, particularly in industries that require strict tracking of items, such as defense or aerospace.
  
  Cause:
  The error arises when:
  
  The configuration for the material or item in question is set to require external creation of UIIs.
  The system is attempting to create a UII internally, which is not permitted under the current settings.
  
  
  Solution:
  To resolve this error, you can consider the following steps:
  
  
  Check Material Master Settings:
  
  Go to the material master record for the item in question.
  Check the settings related to UII under the relevant views (e.g., Basic Data, Plant Data, etc.).
  Ensure that the UII creation settings align with your business process requirements.
  
  
  
  Adjust UII Creation Settings:
  
  If internal creation of UIIs is