How To Fix OO097 - Changes to the interface or a non-final class are incompatible

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 097

• Message text: Changes to the interface or a non-final class are incompatible

What causes this issue?

If you want to edit an interface:
After the interface was transported, changes to the interface are
always incompatible, either for the caller of interface methods (when
you change or delete components), or for the classes that implement the
interface (any changes).

How to fix this error?

If you want to edit an interface:
When the class is not yet final and the interface was already
transported, changes to the interface are always incompatible, either
for the calling program (when you change or delete components), or for
subclasses (when you add or delete public or protected components)

How to fix this error?

Consider whether the planned changes are really necessary. After you
have changed the interface, make sure that you inform those responsible
for the classes that implement or inherit it, since these classes can
be syntactically incorrect as a result of your changes.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message OO097 - Changes to the interface or a non-final class are incompatible ?

  The SAP error message OO097, which states "Changes to the interface or a non-final class are incompatible," typically occurs in the context of ABAP Object-Oriented programming. This error indicates that there has been a change in the interface or a non-final class that is incompatible with existing implementations or subclasses.
  Cause:
  
  Changes to Interfaces: If an interface has been modified (e.g., methods added, removed, or changed), any class implementing that interface may become incompatible if it does not conform to the new definition.
  Changes to Non-Final Classes: If a non-final class has been changed (e.g., methods added or changed), subclasses that were previously created may not be compatible with the new structure.
  Inheritance Issues: If a subclass does not implement all the required methods from the modified superclass or interface, it will lead to this error.
  Versioning Issues: If there are multiple versions of a class or interface in use, changes in one version may not be compatible with another.
  
  Solution:
  
  Review Changes: Check the changes made to the interface or class. Ensure that all implementing classes or subclasses are updated to reflect these changes.
  Implement Missing Methods: If methods were added to an interface or superclass, ensure that all implementing classes or subclasses implement these methods.
  Check for Compatibility: If you have made changes to a class or interface, ensure that all dependent classes are compatible with these changes.
  Use Final Classes: If a class is not intended to be subclassed, consider marking it as FINAL to prevent further inheritance and potential compatibility issues.
  Recompile: After making the necessary changes, recompile the affected classes and interfaces to ensure that the system recognizes the updates.
  Testing: After making changes, thoroughly test the affected classes and interfaces to ensure that they work as expected.
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP ABAP documentation for guidelines on object-oriented programming and interface management.
  SAP Community: Engage with the SAP Community forums for insights and solutions from other developers who may have encountered similar issues.
  Version Control: Implement version control for your ABAP code to track changes and manage compatibility more effectively.
  Best Practices: Follow best practices for object-oriented design in ABAP, such as using interfaces and abstract classes appropriately to minimize compatibility issues.
  
  By addressing the underlying causes and following the suggested solutions, you should be able to resolve the OO097 error and ensure compatibility in your ABAP programs.