I have done some research on subreports and have even built report that use several subreports.
I am having an issue combining 2 already made reports so that they bo
There is now a third way to concatenate them, especially if the reports have different page size and/or orientation.
Instead of running them as subreports inside a master report, you can run them as parts inside a book report.
Please check the /demo/samples/book sample inside the JR Lib project distro package and you can see how 3 reports with different layouts are run together to produce a single file output.
Also, the /demo/samples/tableofcontents sample relies on this new type of report template, which we call book and is made of parts instead of bands.