How To Fix MGV057 - No class for specialization type &1 implemented

SAP Error Message - Details

• Message type: E = Error

• Message class: MGV - Messages for material versions

• Message number: 057

• Message text: No class for specialization type &1 implemented

What causes this issue?

You want to specialize a material to specialization category &v1&.
However, no class has been entered that implements the necessary
interface.

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?

Maintain the relevant class in the transaction STCU.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MGV057 - No class for specialization type &1 implemented ?

  The SAP error message MGV057 "No class for specialization type &1 implemented" typically occurs in the context of the SAP system when there is an issue related to the classification system, particularly when dealing with material master data or classification data.
  Cause:
  
  Missing Class Implementation: The error indicates that there is no class implemented for the specified specialization type. This can happen if the system is trying to access a classification that has not been defined or is not properly set up in the system.
  Incorrect Configuration: The classification system may not be configured correctly, leading to the inability to find the necessary class for the specified specialization type.
  Data Inconsistency: There may be inconsistencies in the data, such as missing entries in the classification tables or incorrect links between materials and their classifications.
  
  Solution:
  
  
  Check Class Implementation:
  
  Go to the transaction code CL02 (Change Class) or CL03 (Display Class) and check if the class for the specified specialization type exists.
  If it does not exist, you may need to create it using transaction code CL01 (Create Class).
  
  
  
  Review Specialization Types:
  
  Ensure that the specialization type referenced in the error message is correctly defined in the system. You can check this in the classification settings.
  
  
  
  Check Material Master Data:
  
  Verify that the material master data is correctly linked to the classification. Use transaction code MM03 (Display Material) to check the classification view of the material.
  
  
  
  Configuration Settings:
  
  Review the configuration settings for the classification system in the SPRO (SAP Project Reference Object) transaction. Ensure that all necessary settings for the classification and specialization types are correctly configured.
  
  
  
  Data Consistency Check:
  
  Run consistency checks on the classification data to identify any inconsistencies or missing entries. This can often be done through specific reports or tools provided by SAP.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for more detailed information on classification and specialization types.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  CL01: Create Class
  CL02: Change Class
  CL03: Display Class
  MM03: Display Material
  SPRO: Customizing (Configuration)
  
  
  
  SAP Notes: Check SAP Notes related to classification and the specific error message for any patches or updates that may address the issue.
  
  
  Support: If the issue persists after checking the above points, consider reaching out to SAP support or your internal SAP team for further assistance.
  
  
  By following these steps, you should be able to identify and resolve the cause of the MGV057 error in your SAP system.