How To Fix MW170 - Material class type & not found

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 170

• Message text: Material class type & not found

What causes this issue?

The <DS:GLOS.class_type>material class type</> was not found in the
classification system.

System Response

The material class type valid for an allocation rule is defined by the
allocation rule type. If the allocation rule type refers to a material
class type that no longer exists in the classification system, an error
occurs and the program is terminated.

How to fix this error?

Re-define the material class type in the classification system.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MW170 - Material class type & not found ?

  The SAP error message MW170 indicates that a material class type is not found in the system. This error typically occurs when you are trying to create or manage materials in the Material Management (MM) module, and the system cannot find the specified material class type.
  Cause:
  
  Missing Material Class Type: The specified material class type does not exist in the system. This could be due to a configuration issue or because the class has not been created.
  Incorrect Configuration: The material class type may not be properly configured in the system, leading to the error.
  Authorization Issues: The user may not have the necessary authorizations to access the material class type.
  Data Entry Error: There may be a typographical error in the material class type being entered.
  
  Solution:
  
  
  Check Material Class Type:
  
  Go to the transaction code CL02 (Change Class) or CL03 (Display Class) to check if the material class type exists.
  If it does not exist, you may need to create it using transaction code CL01 (Create Class).
  
  
  
  Create Material Class Type:
  
  If the class type is missing, you can create it by defining the class type and its characteristics in the Class Builder.
  
  
  
  Verify Configuration:
  
  Ensure that the material class type is correctly configured in the system. This includes checking the settings in the Customizing (SPRO) for Material Management.
  
  
  
  Check Authorizations:
  
  Ensure that the user has the necessary authorizations to access and manage the material class type. This can be checked with your SAP security team.
  
  
  
  Correct Data Entry:
  
  Double-check the material class type being entered for any typographical errors. Ensure that it matches the expected format.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources for additional guidance on material class types and their configuration.
  
  
  
  Related Information:
  
  Transaction Codes:
  
  CL01: Create Class
  CL02: Change Class
  CL03: Display Class
  SPRO: Access Customizing settings
  
  
  Material Management (MM) Module: Understanding how material classes are used in the MM module can help in troubleshooting related issues.
  SAP Notes: Check SAP Notes for any known issues or patches related to material class types.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or refer to SAP's support portal for further assistance.