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

 Message        <Context> "<expression>" has a larger data size than
                "<target type>".  Cast might result in data loss.

 Description    An integer or pointer expression is being cast to a
                size that is smaller than the expression.  Because of
                this, the cast might cause data to be lost.

 User Action    Verify that no unexpected data can be lost by the
                cast.