Eclipse Scout works fine with both of the technologies mentioned but has no built-in support to facilitate working with JasperReports or Birt.
Indeed we did some integration work to smoothly work with those two technologies in Eclipse Scout projects with success. Unfortunately, this is just experimental and therefore not bundled within the official Scout release yet. But we have good experience in both technologies which is why we are using JasperReports to generate PDF or MS Word documents and BIRT chart API to render inline application charts.
If you like I can provide you with our internal integration Plug-Ins to facilitate working on those things. Anyway, please be in mind that at this very time, it is not on our schedule to port those integration Plug-Ins to open source.
If simply having to export some data to MS Excel I suggest you to use Apache POI or something similar instead. This would be much simpler than using JasperReports or Birt. Of couse if doing some more sophisticated reports, JasperReports or Birt would be a good choice for sure.