Rational Developer for System z
PL/I for Windows, Version 7.6, Programming Guide

Margins

By default, the compiler ignores any data in the first column of your source program file and sets the right margin 72 spaces from the left.

You can change the default margin setting (see MARGINS). If you choose to keep the default setting, your source code should begin in column 2.

Note:
The %PROCESS (or *PROCESS) statement is an exception to the margin rule and must start in the first column. For more information about the %PROCESS statement, see %PROCESS statement.

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