How To Fix MW381 - &1 is not a valid class type

SAP Error Message - Details

• Message type: E = Error

• Message class: MW - Messages IS-R / Allocation Tables

• Message number: 381

• Message text: &1 is not a valid class type

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 MW381 - &1 is not a valid class type ?

  The SAP error message "MW381 &1 is not a valid class type" typically occurs in the context of Material Management (MM) or when dealing with classification in SAP. This error indicates that the system is unable to recognize the specified class type, which is essential for classifying materials or other objects in the system.
  Cause:
  
  Invalid Class Type: The class type specified in the transaction or configuration does not exist in the system or is incorrectly entered.
  Configuration Issues: The class type may not be properly configured in the system, or it may have been deleted or deactivated.
  Authorization Issues: The user may not have the necessary authorizations to access the specified class type.
  Data Entry Errors: There may be typographical errors in the class type field when entering data.
  
  Solution:
  
  
  Check Class Type: Verify that the class type you are trying to use is valid. You can do this by navigating to the classification system in SAP and checking the list of available class types.
  
  Use transaction code CL02 to display class types and ensure that the class type exists.
  
  
  
  Correct Configuration: If the class type is missing or incorrectly configured, you may need to create or adjust it using transaction code CL01 (Create Class) or CL02 (Change Class).
  
  
  Review Authorizations: Ensure that the user has the necessary authorizations to access the class type. This may involve checking user roles and permissions in the SAP system.
  
  
  Data Entry Validation: Double-check the input for any typographical errors. Ensure that the class type is entered correctly in the relevant fields.
  
  
  Consult Documentation: If you are unsure about the class types and their configurations, refer to SAP documentation or consult with your SAP Basis or MM consultant for guidance.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CL01, CL02, CL03 (Display Class), and CL24 (Class Type).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. You can search for notes in the SAP Support Portal.
  SAP Community: Engage with the SAP Community forums for insights and solutions from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify the cause of the error and implement the necessary solutions to resolve it.