3258646 - Issues extending Worklist and Object Controller files - "Method 'onSave' does not exist in controller..."

• Only methods that are defined in BaseController.js file can be extended 
• Is there any limitation that can be shared why worklist/object controller files cannot be extended
• Example of errors when using some of the methods of the controller:
  
  ~~~Sample error~~~~
  
  • We are able to use override hook methods (onInit, onAfretRendering).
    
    However, we are getting an error message when we try to override the methods from controller, in the console as below - 
    "Method 'onSave' does not exist in controller XXX.YYY.PROJECTFILE.controller.Object and cannot be overridden" (NOTE: Where XXX.YYY.PROJECTFILE is simply a dummy package name placeholder to make this a general error for reference)
    
    

 S/4HANA 1909 or others

"Controller OnSave","Worklist OnSave","MVC controller","controller.Object and cannot be overridden","Method 'onSave' does not exist in controller" , KBA , CA-UI5-COR , Core and Runtime , Problem