For other modeled classes in the application (such as Process, Facade, WSInbound and WebService), the use of all extensions mechanisms is now discouraged.
Prior to version 6.0.3, Subclass with Replace was a commonly used mechanism for adding and changing operations on application Process and Facade classes. As with extension of application Entity classes, however, this is now potentially unsafe, in that customers will no longer necessarily have full visibility as to where such classes are used.
Similar to with Entity classes, customers should instead model and code their own Process, Facade or WSInbound classes, either wrapping existing External APIs, or implementing new functionality. For Facade operations, affected UIM pages can be repointed at the new Facade operations if desired.