How To Fix KE409 - User exit must start with 'U'

KE409 - Overview

• Message type: E = Error

• Message class: KE -

• Message number: 409

• Message text: User exit must start with 'U'

What causes this issue?

User exit &V1& does not begin with the prefix 'U'.

System Response

All customer user exits must begin with the prefix 'U' (e.g. 'U01',
'UAA').

How to fix this error?

The first letter of your user exit be the letter 'U'.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message KE409 - User exit must start with 'U' ?

  The SAP error message KE409 ("User exit must start with 'U'") typically occurs in the context of SAP Controlling (CO) when you are trying to implement a user exit in a way that does not conform to the naming conventions expected by the system. This error is specifically related to user exits in the CO module, which are custom enhancements that allow you to add your own functionality to standard SAP processes.
  
  Cause:
  The error is triggered when a user exit is defined or called with a name that does not start with the letter 'U'. SAP has a naming convention for user exits, and all user exits must begin with 'U' to be recognized by the system. This is a safeguard to ensure that custom code does not conflict with standard SAP code.
  
  Solution:
  To resolve the KE409 error, you should:
  
  
  Check the User Exit Name: Ensure that the user exit you are trying