How To Fix CNV_OR_PE021 - Class &1 does not implement interface &2 (system ID=&3)

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_OR_PE - Messages for remote components

• Message number: 021

• Message text: Class &1 does not implement interface &2 (system ID=&3)

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_OR_PE021 - Class &1 does not implement interface &2 (system ID=&3) ?

  The SAP error message CNV_OR_PE021 indicates that a specific class does not implement a required interface. This error typically arises in the context of SAP's data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or other tools that rely on object-oriented programming principles.
  Cause:
  
  
  Class Implementation Issue: The class specified in the error message (denoted as &1) is expected to implement a certain interface (denoted as &2), but it does not. This could be due to:
  
  The class being incorrectly defined or not fully implemented.
  The interface being newly introduced or modified, and the class not being updated accordingly.
  A missing or incorrect configuration in the system.
  
  
  
  System ID Issue: The error message also includes a system ID (&3), which indicates the specific SAP system where the error occurred. This can help in identifying if the issue is specific to a particular environment.
  
  
  Solution:
  
  
  Check Class Implementation:
  
  Go to the ABAP Workbench (transaction SE80) and locate the class mentioned in the error message.
  Verify if the class implements the required interface. If it does not, you may need to modify the class to implement the interface correctly.
  
  
  
  Update Class:
  
  If the class is part of a custom development, ensure that it is updated to implement all methods defined in the interface.
  If the class is part of standard SAP, consider checking for any available support packages or notes that might address this issue.
  
  
  
  Check for Missing Dependencies:
  
  Ensure that all necessary components and dependencies are correctly installed and activated in your SAP system.
  
  
  
  Consult SAP Notes:
  
  Search the SAP Support Portal for any relevant SAP Notes that might provide additional guidance or fixes related to this error.
  
  
  
  Testing:
  
  After making the necessary changes, test the functionality again to ensure that the error is resolved.
  
  
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like SE80 (Object Navigator) or SE24 (Class Builder) to investigate the class and interface.
  SAP Support: If you are unable to resolve the issue, consider reaching out to SAP Support for assistance, providing them with the error details and any steps you have already taken.
  Documentation: Review the documentation for the specific migration or conversion tool you are using, as it may provide additional context or requirements for class and interface implementations.
  
  By following these steps, you should be able to identify the root cause of the CNV_OR_PE021 error and implement a solution.