/sys$common/syshlp/helplib.hlb CC, Messages, INCOMPCALL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        <Context> the return type of "<expression>" is
                incomplete.

 Description    A function with an incomplete return type other than
                void cannot be invoked.

 User Action    Complete the function return type before the function
                is invoked.