How To Fix SEMC012 - This class exists in the old structure. Conversion not possible

SAP Error Message - Details

• Message type: E = Error

• Message class: SEMC - Messages for Function Group SEMC

• Message number: 012

• Message text: This class exists in the old structure. Conversion not possible

What causes this issue?

This class &V1&still exists in the old structure in the target system.
Creating the new class Include is not possible with the Correction
Workbench ( SCWB ) or the Note Assistant.

System Response

The Note Assistant or Correction Workbench shows a red traffic light for
the class.

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?

Convert the class include structure manually in transaction SE24. For
this, use the menu entry "Utilities -> Convert Local Class Types".
In a customer system, this function for conversion is normally not
active. It can, however, be activated by importing note number 830204.
Afterwards, you can copy your request again using the Correction
Workbench or the Note Assistant.

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 SEMC012 - This class exists in the old structure. Conversion not possible ?

  The SAP error message SEMC012, which states "This class exists in the old structure. Conversion not possible," typically occurs in the context of SAP's classification system, particularly when dealing with the migration or conversion of classification data from an older structure to a newer one.
  Cause:
  
  Old Structure: The error indicates that the class you are trying to work with is still linked to an old classification structure that is not compatible with the current system or the new structure you are trying to implement.
  Data Migration Issues: This can happen during data migration processes where the system expects a certain structure or format that the existing class does not conform to.
  Configuration Issues: There may be configuration settings that have not been updated to reflect the new structure, leading to inconsistencies.
  
  Solution:
  
  Check Class Structure: Verify the class structure in the SAP system. You may need to check if the class is still using the old structure and if it needs to be converted or updated.
  Convert Class: If possible, convert the class to the new structure. This may involve using transaction codes like CL02 (Change Class) or CL03 (Display Class) to review and modify the class settings.
  Data Migration Tools: If you are in the process of migrating data, ensure that you are using the correct tools and methods to convert old classes to the new structure. SAP provides various tools for data migration that should be utilized.
  Consult Documentation: Refer to SAP documentation or notes related to classification and data migration for specific steps or tools that may be required for your version of SAP.
  Contact SAP Support: If the issue persists, consider reaching out to SAP support for assistance, especially if this is part of a larger migration or upgrade project.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CL01 (Create Class), CL02 (Change Class), and CL03 (Display Class) for managing classes in SAP.
  SAP Notes: Search for SAP Notes related to SEMC012 or classification issues in the SAP Support Portal, as they may provide specific fixes or workarounds.
  System Upgrade: If this error arises after a system upgrade, review the upgrade documentation to ensure all necessary steps were followed for classification data.
  Testing: After making changes, conduct thorough testing to ensure that the class functions correctly in the new structure and that there are no further issues.
  
  By following these steps, you should be able to address the SEMC012 error and ensure that your classification data is correctly aligned with the current system structure.