actually, i have found an error with it. version 2.14 however... and in 2.16 and 2.18 its been ...somewhat fixed. (bypassed really) Tho, i have untested this directly.
in 2.14 (version i use) you add a discount by LINE. (which Looks great) in 2.16+ the discounts are in Column, which looks unprofessional. I did NOT test this, but as it directly changes the subtotal by line, it would be correct at the totals.
in 2.14 the discount line is not counted at all. Just the Line of the adds, not the subs. So, of course, if the option is replaced, this would need to be adjusted accordingly. (altho i dont personally USE the unpaid report often, I assume that the program might use that to determine whom to send invoices to, rather than each invoice individually. (unsure)
Thanks for pointing out what you thought was an error, so i had to check mine! lol.
gk