How To Fix SWF_FLEX_DEF121 - Do not change super class. Please create own class which inherits from &1

SAP Error Message - Details

• Message type: E = Error

• Message class: SWF_FLEX_DEF -

• Message number: 121

• Message text: Do not change super class. Please create own class which inherits from &1

What causes this issue?

Super class CL_SWF_FLEX_IFS_RUN_APPL_BASE should not be changed.

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

System Response

How to fix this error?

Create a new class in SE24 which inherits form super class
CL_SWF_FLEX_IFS_RUN_APPL_BASE. Then you can redefine and adapt the
method IF_SWF_FLEX_IFS_RUN_APPL~RESULT_CALLBACK.

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 SWF_FLEX_DEF121 - Do not change super class. Please create own class which inherits from &1 ?

  The SAP error message SWF_FLEX_DEF121 indicates that there is an attempt to modify a superclass in a way that is not allowed. This typically occurs in the context of workflow development in SAP, particularly when dealing with class inheritance in ABAP (Advanced Business Application Programming).
  Cause:
  The error arises when a developer tries to change the definition of a superclass directly, which is not permitted. Instead, the system expects the developer to create a new class that inherits from the existing superclass. This is a safeguard to maintain the integrity of the superclass and ensure that all subclasses behave consistently.
  Solution:
  To resolve this error, follow these steps:
  
  
  Create a New Class: Instead of modifying the superclass, create a new class that inherits from the specified superclass (denoted as &1 in the error message). You can do this by using the ABAP Class Builder (transaction SE24).
  
  
  Define Inheritance: When creating the new class, specify the superclass in the "Inheritance" section. This will allow your new class to inherit the properties and methods of the superclass.
  
  
  Implement Custom Logic: In your new class, you can implement any custom logic or methods that you need. This way, you can extend the functionality without altering the original superclass.
  
  
  Adjust Workflow Definitions: If your workflow is referencing the superclass, ensure that it is updated to use your new subclass where necessary.
  
  
  Test the New Class: After creating the new class and implementing your changes, thoroughly test it to ensure that it behaves as expected and integrates well with the existing workflow.
  
  
  Related Information:
  
  ABAP Class Builder (SE24): This transaction is used to create and manage ABAP classes and interfaces.
  Inheritance in ABAP: Understanding how inheritance works in ABAP is crucial. A subclass can inherit attributes and methods from a superclass, allowing for code reuse and better organization.
  SAP Workflow: Familiarize yourself with SAP Workflow concepts, as this error is related to workflow development. Understanding how workflows are structured and how classes are used within them can help prevent similar issues in the future.
  
  By following these steps, you should be able to resolve the SWF_FLEX_DEF121 error and continue with your workflow development in SAP.