CtTypeReference#getDeclaration returns null for an element created by developer

[GerardPaligot]

If you create a CtInterface, get its reference and call CtTypeReference#getDeclaration(), this last invocation returns null but it should return the CtInterface created before.

CtInterface anInterface = factory.Interface().create(...);
CtTypeReference anInterfaceRef = anInterface.getReference();
anInterfaceRef.getDeclaration() // returns null