How To Fix UD404 - Assignment already exists

UD404 - Overview

• Message type: E = Error

• Message class: UD - EDM - Enterprise Data Model

• Message number: 404

• Message text: Assignment already exists

What causes this issue?

You tried to assign another data model or an entity type already
assigned to the data model. Multiple assignments on a single hierarchy
level are not allowed.

System Response

The desired operation was not performed.

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.

UD404 - Details

• The SAP error message UD404 "Assignment already exists" typically occurs in the context of user data assignments, such as when trying to assign a user to a role, a position, or a similar entity in the SAP system. This error indicates that the assignment you are trying to create already exists in the system, which prevents the action from being completed.
  Causes:
  
  Duplicate Assignment: The most common cause is that the user or entity you are trying to assign is already linked to the role or position you are attempting to assign them to.
  Data Entry Error: There may be a mistake in the data entry, such as trying to assign the same user multiple times.
  System Configuration: There might be a configuration issue in the system that is causing the error to be triggered incorrectly.
  
  Solutions:
  
  
  Check Existing Assignments: 
  
  Navigate to the relevant transaction (e.g., SU01 for user management, PFCG for role management) and check