The FOOTNOTE statement
takes effect when the step or RUN group with which it is associated
executes. Once you specify a footnote for a line, SAS repeats the
same footnote on all pages until you cancel or redefine the footnote
for that line.
The maximum footnote
length under Windows is 256 characters. If the specified footnote
is greater than the LINESIZE system option, the footnote is truncated
to the line size.