How To Fix MR017 - Class & unknown

MR017 - Overview

• Message type: E = Error

• Message class: MR - Stock overview for generic materials

• Message number: 017

• Message text: Class & unknown

What causes this issue?

You are using a material group or a generic material for which no data
exists in the classification system. There must be a serious database
inconsistency.

System Response

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

Notify your system administrator.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MR017 - Class & unknown ?

  The SAP error message MR017, which states "Class & unknown," typically occurs in the context of the Materials Management (MM) module, particularly when dealing with invoice verification or material documents. This error indicates that the system is unable to recognize or find a specific class that is required for processing.
  Causes:
  
  Missing Class Definition: The class that is referenced in the transaction is not defined in the system.
  Incorrect Configuration: There may be an issue with the configuration settings related to classification or material master data.
  Authorization Issues: The user may not have the necessary authorizations to access the class or related data.
  Data Inconsistencies: There could be inconsistencies in the data that are causing the system to fail to recognize the class.
  
  Solutions:
  
  
  Check Class Definition:
  
  Go to the transaction code CL02 (Change Class) or CL03 (Display Class) to verify if the class exists.
  If it does not exist, you may need to create it using CL01 (Create