Why can't I get access to renaming the superclass in Kotlin?

Question

I am converting a Java Android project to Kotlin.

I use the API.AI client , which has two classes AIConfiguration:

Super class

package ai.api;
public class AIConfiguration implements Cloneable {
     public static enum SupportedLanguages {
         English("en"),
         //...
     }
         //...
}

Subclass

package ai.api.android;
public class AIConfiguration extends ai.api.AIConfiguration {
    public enum RecognitionEngine {
    //...
}

In my Java code, I created an instance of a subclass, as recommended in the api manual:

final AIConfiguration config = new AIConfiguration("TOKEN",
        AIConfiguration.SupportedLanguages.English,
        AIConfiguration.RecognitionEngine.System);

After converting to Kotlin, it looks like this:

val config = AIConfiguration("TOKEN",
        AIConfiguration.SupportedLanguages.English,
        AIConfiguration.RecognitionEngine.System)

... which causes . Unresolved reference: SupportedLanguages

• I can update the link to ai.api.AIConfiguration.SupportedLanguages.Englishthat compiles successfully.
• I can import the superclass with import ai.api.AIConfiguration as SuperAIConfigurationand use SuperAIConfiguration.SupportedLanguages, but I would rather refer to the enumeration directly to the subclass.

I do not understand: why is this link valid in Java, but not in Kotlin?