How To Fix IM409 - Function code not defined

IM409 - Overview

• Message type: E = Error

• Message class: IM - Maintenance notifications

• Message number: 409

• Message text: Function code not defined

What causes this issue?

You tried to complete a PM notification from the list.

System Response

The system could not find the internal function code (LIAR) in the
control table (TC33).

How to fix this error?

Inform your system administrator.

Error message extract from SAP system. Copyright SAP SE.

IM409 - Details

• The SAP error message IM409 ("Function code not defined") typically occurs when a user attempts to execute a function in a transaction or program that does not have a corresponding function code defined in the system. This can happen for various reasons, including configuration issues, missing authorizations, or incorrect program logic.
  Causes of IM409 Error
  
  Missing Function Code: The function code that the program is trying to call is not defined in the GUI or the program logic.
  Authorization Issues: The user may not have the necessary authorizations to execute the function code.
  Custom Development: If the transaction or program has been customized, the function code may not have been properly defined or linked.
  Incorrect Transaction Code: The user may be using an incorrect or outdated transaction code that does not correspond to any defined function.
  Program Errors: There may be bugs or errors in the ABAP code that prevent the function code from being recognized.
  
  Solutions