How To Fix ICF_SYSTEM_LOGIN401 - Class "&1" is not a valid logon class

SAP Error Message - Details

• Message type: E = Error

• Message class: ICF_SYSTEM_LOGIN - Messages for System Logon

• Message number: 401

• Message text: Class "&1" is not a valid logon class

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message ICF_SYSTEM_LOGIN401 - Class "&1" is not a valid logon class ?

  The SAP error message "ICF_SYSTEM_LOGIN401 Class '&1' is not a valid logon class" typically indicates that there is an issue with the logon class configuration in the SAP system. This error can occur when a user attempts to log in to the SAP system, and the specified logon class is not recognized or is incorrectly configured.
  Cause:
  
  Invalid Logon Class: The logon class specified in the user profile or during the login attempt does not exist or is misspelled.
  Configuration Issues: The logon class may not be properly configured in the system, or it may have been deleted or modified.
  Authorization Issues: The user may not have the necessary authorizations to use the specified logon class.
  Profile Assignment: The user profile may not be correctly assigned to the logon class.
  
  Solution:
  
  
  Check Logon Class Configuration:
  
  Go to transaction code SU01 (User Maintenance) and check the user profile for the logon class assigned.
  Verify that the logon class exists by checking transaction code SUC1 (Logon Classes). Ensure that the class is correctly defined and active.
  
  
  
  Correct Logon Class:
  
  If the logon class is incorrect, update the user profile with a valid logon class.
  If the logon class does not exist, create a new logon class in transaction SUC1.
  
  
  
  Review Authorizations:
  
  Ensure that the user has the necessary authorizations to use the logon class. This can be checked in the user’s authorization profile.
  
  
  
  Check System Settings:
  
  Review the system settings related to logon classes to ensure that they are configured correctly.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for more detailed information on logon classes and user management.
  
  
  
  Related Information:
  
  Logon Classes: Logon classes in SAP are used to control the number of users that can log on to the system simultaneously. They can also define the priority of users based on their roles or requirements.
  Transaction Codes:
  
  SU01: User Maintenance
  SUC1: Logon Classes
  SU10: Mass User Maintenance (if you need to change multiple users)
  
  
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to logon classes or user management.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP Basis team or SAP support for further assistance.