I've spent a plenty to time trying to understand how is the reports in (Health + Reporting) Modules are being created so that I can perform some changes, specially for creating Statistics reports.
Also i checked both ( GNU Health's Technical Guide ) and ( Tryton documentation ) I didn't find anything useful regarding this matter, and I found some example links in the Tryton docs but all the links are dead, right here:
http://doc.tryton.org/1.4/trytond/doc/reports.html Please, if you can help me understand how it works, or if you have any documents that might be useful to achieve this;