How To Fix WW406 - Class type & does not exist

WW406 - Overview

• Message type: E = Error

• Message class: WW - Material group master maintenance

• Message number: 406

• Message text: Class type & does not exist

What causes this issue?

This class type is not defined.

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?

INCLUDE ISR_CHECK

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WW406 - Class type & does not exist ?

  The SAP error message WW406 indicates that a specified class type does not exist in the system. This error typically arises when you are trying to create or manipulate an object in SAP that references a class type that has not been defined or is not available in the system.
  
  Cause:
  
  Non-existent Class Type: The class type you are trying to use has not been created in the system.
  Incorrect Class Type: There may be a typo or an incorrect reference to the class type in your configuration or code.
  Authorization Issues: The user may not have the necessary authorizations to access the class type.
  Transport Issues: If the class type was recently transported from another system, it may not have been successfully imported.
  
  
  Solution:
  
  Check Class Type: Verify that the class type you are trying to use actually exists in the system. You can do this by navigating to the relevant transaction (e.g., CL02 for class