How To Fix MW170 - Material class type & not found

MW170 - Overview

• 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.

MW170 - Details

• 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