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

 Message        <Context> the enumeration constant "<name>" is out of
                range INT_MIN to INT_MAX and will be truncated.

 Description    An enumeration constant must be representable as an
                int type.  The specified value is outside the range
                of an int.  In modes where this is a warning, the
                compiler will use the low-order bits to form the int
                value.

 User Action    Use a valid constant value.