Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide

DEFAULT statement

Factored default specifications are not supported.

For example, a statement such as the following is not supported:

   default ( range(a:h), range(p:z) ) fixed bin;

But you could change the above statement to the following equivalent and supported statement:

   default range(a:h) fixed bin, range(p:z) fixed bin;

The use of a "(" after the DEFAULT keyword is reserved for the same purpose as under the ANSI standard: after the DEFAULT keyword, the standard allows a parenthesized logical predicate in attributes.

Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide