ref:https://groups.google.com/forum/#!topic/idempiere/YXZVLT9GX1c

reattach some 16 jasper report is very hard.
because I switch to use this way, make fragment project.
But seem it's have some limit:

+ same nicolas, Image is not load
+ naming of sub-report must below a rule
+ number of sub-report is restrict to 10

make this ticket to improve it :
use below api to discover name of subreport, name of image
http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/JRElementGroup.html#getElements()

http://wiki.idempiere.org/en/JasperReports_redesign