How To Fix ON121 - Selection of all classes switched on or off

ON121 - Overview

• Message type: E = Error

• Message class: ON - Tools in area Object Modeler / Object Editor

• Message number: 121

• Message text: Selection of all classes switched on or off

What causes this issue?

You have chosen Edit->Select on/off->Classes. On this and the following
screens all classes will now be displayed selected or unselected.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

No action is required. This is just for your information.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message ON121 - Selection of all classes switched on or off ?

  The SAP error message ON121, which states "Selection of all classes switched on or off," typically occurs in the context of class selection in the SAP system, particularly when dealing with classification or variant configuration.
  
  Cause:
  This error message usually arises when there is a conflict in the selection criteria for classes in a classification system. It can occur if:
  
  The user has attempted to select or deselect all classes in a way that is not allowed by the system.
  There may be inconsistencies in the configuration settings or the way classes are defined in the system.
  The selection criteria may not be properly set, leading to ambiguity in the selection process.
  
  
  Solution:
  To resolve the ON121 error, you can try the following steps:
  
  
  Check Selection Criteria: Review the selection criteria you are using. Ensure that you are not trying to select or deselect all classes simultaneously in a way that conflicts with the system's rules.
  
  
  Review Class Definitions: