1. Select the class which you want to enhance, choose "Enhance".
2. Create a new enhancement and maintain description.
3. Save to local pacakge.
4. Select the method you want to enhance and create a Post method.
5. if unfortunately you meet with an error and creation terminates.
The exception is raised since the class has an old "local type".
In order to eliminate this exception, we need to do some conversion via Utilities as displayed below: