VMS Help CC, Messages, INTCONCASTSGN  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        <Context> casting of the constant "<constant>" to
                <type> type will cause a change in sign.

 Description    Either a negative constant value has been cast to an
                unsigned type, or a positive value has been cast to a
                signed type and will be treated as a negative number
                after the cast.

 User Action    Change the constant so that the sign will match the
                type of the cast.