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

SAP Error Message - Details

• 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 to implement or call starts with the letter 'U'. If it does not, rename it accordingly.
  
  
  Modify the Code: If you are writing custom code that references a user exit, make sure that any user exit names you are using conform to the naming convention.
  
  
  Review Documentation: Consult the SAP documentation or the specific enhancement documentation for the user exit you are working with to ensure you are using the correct naming and implementation practices.
  
  
  Use Transaction Codes: You can use transaction codes like SE80 (Object Navigator) or SE37 (Function Module) to find and manage user exits and ensure they are correctly defined.
  
  
  Testing: After making the necessary changes, test the functionality to ensure that the error is resolved and that the user exit behaves as expected.
  
  
  Related Information:
  
  User Exits: User exits are predefined points in the SAP standard code where you can add your own custom code. They are often used to enhance functionality without modifying the original SAP codebase.
  Enhancement Framework: In addition to user exits, SAP provides other enhancement options such as BAdIs (Business Add-Ins) and enhancement spots, which may offer more flexibility and are recommended for new developments.
  SAP Notes: Check SAP Notes for any specific guidance or updates related to the user exit you are working with, as there may be known issues or additional requirements.
  
  By following these steps, you should be able to resolve the KE409 error and successfully implement your user exit in SAP.