[Koha] More questions about fines

[George Adams]

I'm trying to setup fines rules such that a patron gets a 7 day grace period after their due date, then starts getting charged $0.50 every week that the book isn't checked in.  (This is for a church library, so the days when a patron can check in a late book are limited.  Hence, I only want to bump the fine up every 7 days).

So for instance if your book was due on Feb. 1, you should get a grace period for a week.  Then, on Feb. 8 you get your first $0.50 fine.  A week later on Feb. 15 you get another $0.50 fine.

So I setup the fines rules for all types as "0.5,7,7".  According to the docs, this should generate a $0.50 fine every 7 days after the 7-day grace period has expired.

But when running cronjobs/fines2.pl with a test checkout, it didn't turn out the way I expected.  Here are the results.

Today is Feb 28 (close-of-business)
Book was due on:
  Feb 27, so fine = $0 (1 day overdue)
  Feb 26, so fine = $0 (2 days overdue)
  Feb 25, so fine = $0 (3 days overdue)
  Feb 24, so fine = $0 (4 days overdue)
  Feb 23, so fine = $0 (5 days overdue)
  Feb 22, so fine = $0 (6 days overdue)
  Feb 21, so fine = $0 (7 days overdue)
  Feb 20, so fine = $0 (8 days overdue)
  Feb 19, so fine = $0 (9 days overdue)
  Feb 18, so fine = $0 (10 days overdue)
  Feb 17, so fine = $0 (11 days overdue)
  Feb 16, so fine = $0 (12 days overdue)
  Feb 15, so fine = $0 (13 days overdue)
  Feb 14, so fine = $0.50 (14 days overdue)*
  Feb 13, so fine = $0.50 (15 days overdue)
  Feb 12, so fine = $0.50 (16 days overdue)
  Feb 11, so fine = $0.50 (17 days overdue)
  Feb 10, so fine = $0.50 (18 days overdue)
  Feb 09, so fine = $0.50 (19 days overdue)
  Feb 08, so fine = $0.50 (20 days overdue)
  Feb 07, so fine = $1.00 (21 days overdue)*
  Feb 06, so fine = $1.00 (22 days overdue)
  Feb 05, so fine = $1.00 (23 days overdue)
  Feb 04, so fine = $1.00 (24 days overdue)
  Feb 03, so fine = $1.00 (25 days overdue)

The fine is kicking in on the 14th day, rather than the 7th day as I had intended.  Is this a bug, or am I misunderstanding the Koha fine rules?

(update: I seem to get what I want setting the rules to "0.5,0,7".  But according to the documentation, that's the equivalent of saying "a $0.50 fine after 0 days every 7 days".  That doesn't sound right.)

Thanks!