Effort property inheritance?

[Sebastien Vauban <sva-news-D0wtAvR13HarG/iDocfnWg@public.gmane.org>]

Hello,

When using this minimal configuration:

--8<---------------cut here---------------start------------->8---
(setq org-agenda-prefix-format
      '((agenda   . " %-11s%i %-12:c%?-12t%7e ")
        (timeline . " % s")
        (todo     . " %i %-12:c")
        (search   . " %i %-12:c")
        (tags     . " %i %-12:c")))

(setq org-agenda-files '("~/agenda.org"))
--8<---------------cut here---------------end--------------->8---

where ~/agenda.org is:

--8<---------------cut here---------------start------------->8---
* Projects

** Projet A
   :PROPERTIES:
   :Effort:   104:00
   :END:

*** TODO Do this...
    DEADLINE: <2014-03-20 Thu>

*** TODO Do that as well!
    DEADLINE: <2014-03-21 Fri>
--8<---------------cut here---------------end--------------->8---

I did _not_ expect to see the effort of the whole project "applied" on every
of its subtasks:

--8<---------------cut here---------------start------------->8---
Week-agenda (W12):
Monday     17 March 2014 W12
Tuesday    18 March 2014
Wednesday  19 March 2014
Thursday   20 March 2014
 Deadline:   agenda:     [104:00] TODO Do this...
Friday     21 March 2014
  1 d. ago:  agenda:     [104:00] TODO Do this...
 Deadline:   agenda:     [104:00] TODO Do that as well!
Saturday   22 March 2014
Sunday     23 March 2014
--8<---------------cut here---------------end--------------->8---

Just to confirm once more (than what's in the ECM), here is the value of
`org-use-property-inheritance':

  ╭────
  │ org-use-property-inheritance is a variable defined in `org.el'.
  │ Its value is nil
  │ 
  │ Documentation:
  │ Non-nil means properties apply also for sublevels.
  │ 
  │ This setting is chiefly used during property searches.  Turning it on can
  │ cause significant overhead when doing a search, which is why it is not
  │ on by default.
  │ 
  │ When nil, only the properties directly given in the current entry count.
  │ When t, every property is inherited.  The value may also be a list of
  │ properties that should have inheritance, or a regular expression matching
  │ properties that should be inherited.
  │ 
  │ However, note that some special properties use inheritance under special
  │ circumstances (not in searches).  Examples are CATEGORY, ARCHIVE, COLUMNS,
  │ and the properties ending in "_ALL" when they are used as descriptor
  │ for valid values of a property.
  ╰────

Am I missing something?

Best regards,
  Seb

-- 
Sebastien Vauban