On appeal to the Court of Appeal, what are the exceptions to the doctrine of sovereign immunity?

On appeal appellants assert that all necessary facts have been alleged to bring them within the recognized exceptions to the doctrine of sovereign immunity. As was recognized in State of Washington v. Udall, 417 F.2d 1310 (9th Cir.1969), when the essence of an appellant's case on the merits requires determination of whether federal officials have exceeded their authority or have exercised that authority in a void manner, the action falls within the exceptions to sovereign immunity. Clearly, the allegations of the appellants require such resolution and, therefore, fall within the exceptions.