To further organize a report, you can
create captions for the Subreport Preview tab and for the placeholder frame of
an on-demand subreport.
Note: Placeholder frame
captions only apply to on-demand subreports, while tab text captions apply to
both on-demand subreports and regular subreports. Since the data from a regular
subreport is visible on the Preview tab, there is no need for a frame caption
when you format a regular subreport.