NORELATIONAL

Message        <Context> "<expression1>" and "<expression2>" cannot
               be compared with a relational operator.

Description    Because of their types, the two expressions cannot be
               used as the operands of a relational operator.  The
               rules for which types can be used in a relational are
               rather complicated and differ based upon the compiler
               mode.  Refer to the language documentation for a
               complete list of valid combinations.

User Action    Modify the relational to use valid types.  This can
               often be done by casting one of the expressions to
               the type of the other.