+Another attribute is "report_separate". This attribute may be used for some additional costs like
+transport, packaging. These article are reported separate in the list of an invoice if
+the print template is using the variables <%separate_XXX_subtotal%> and XXX is the shortcut of the parts classification.
+The variables <%non_separate_subtotal%> has the sum of all other parts of an invoice.
+(See also LaTeX Documentation).
+