[Codeplex #1661] : Unqualified action/function name should fail when call
this action/function

[ODL spec says in 11.5.3.1 Invoking a Function]
To invoke a function bound to a resource, the client issues a GET request
to a function URL. A function URL may be obtained from a previously
returned entity representation or constructed by appending the namespace-
or alias-qualified function name to a URL that identifies a resource whose
type is the same as, or derived from, the type of the binding parameter of
the function. ....