unfortunately I do not have the programming skills to do it alone.
thanks to the work that I do, in the field of management software precisely, I have experience with respect to how it works, the necessary items, headings and db tables that could be used, but are not able to implement them in invoiceplane.
being the base of this project very valid implement the various types of documents used in various fields would make it one of the best.
I could still help by creating, knowing tables and items to be used in advance of the report that I would use it myself and then share them with the community