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

 Message        <Context> a common type could not be determined for
                the 2nd and 3rd operands ("<true expression>" and
                "<false expression>") of a conditional operator.

 Description    The types of the second and third operands of the
                conditional operator must conform to a set of rules
                that define what the type of the result of the
                conditional operator itself will be.  If the types of
                these operands do not conform to those rules, the
                compiler cannot determine the type of the result,
                which is an error.  Refer to the language
                documentation for a complete list of valid
                combinations of types for the second and third
                operands of the conditional operator.

 User Action    Modify the conditional expression so that the types
                of the second and third operands conform to the
                language rules.