How To Fix /SCMB/CNA012 - Class &1 does not inherit from class &2

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCMB/CNA -

• Message number: 012

• Message text: Class &1 does not inherit from class &2

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCMB/CNA012 - Class &1 does not inherit from class &2 ?

  The SAP error message /SCMB/CNA012 Class &1 does not inherit from class &2 typically occurs in the context of SAP Advanced Planning and Optimization (APO) or Supply Chain Management (SCM) when there is an issue with class inheritance in the Customizing or configuration of the system.
  Cause:
  This error indicates that a class (denoted as &1) is expected to inherit from another class (denoted as &2), but it does not. This can happen due to several reasons:
  
  Incorrect Class Definition: The class definition for &1 may not be set up correctly to inherit from &2.
  Changes in Class Hierarchy: If there have been recent changes to the class hierarchy or if classes were modified or deleted, it could lead to this error.
  Configuration Issues: There may be issues in the configuration settings where the system expects a certain class structure that is not met.
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check Class Definitions:
  
  Go to the Class Builder (Transaction Code: CL02).
  Look for the class &1 and check its inheritance settings.
  Ensure that it is correctly set to inherit from class &2.
  
  
  
  Review Class Hierarchy:
  
  Verify if there have been any recent changes to the class hierarchy that might have affected the inheritance.
  If necessary, revert any changes that may have caused the issue.
  
  
  
  Adjust Configuration:
  
  If the error is related to a specific configuration in SCM or APO, review the configuration settings to ensure they are correctly set up.
  Check if there are any dependencies or prerequisites that need to be fulfilled for the classes involved.
  
  
  
  Transport Issues:
  
  If this issue arose after a transport, check if the transport included all necessary objects and dependencies.
  Ensure that the transport was successful and that no objects were left out.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific classes and their expected behavior.
  Check for any known issues or patches that might address this error.
  
  
  
  Debugging:
  
  If the issue persists, consider debugging the program or transaction that is triggering the error to get more insights into what might be going wrong.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific notes related to this error message. SAP frequently updates their knowledge base with solutions for common issues.
  Community Forums: Look for discussions in SAP Community forums or other user groups where similar issues may have been discussed.
  SAP Support: If you are unable to resolve the issue, consider reaching out to SAP Support for assistance.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.