After a reinstallation I forgot to do make autoloads.
Now, it's working perfectly.
It was my mistake, sorry and thank you for your help.

2015-04-25 18:26 GMT+00:00 Eric S Fraga <e.fraga@ucl.ac.uk>:
On Saturday, 25 Apr 2015 at 17:55, Damian Bernardini wrote:
> You were right.
> If I do M-x org-version it says:
> Org-mode version 8.3beta (release_8.3beta-1062-gce4e64-git @ mixed
> installation! /usr/share/emacs/24.5/lisp/org/ and
> /home/damian/git/org-mode/lisp/)
>
> I've downloaded org from git and loaded it with:
> (add-to-list 'load-path "~/git/org-mode/lisp")
> (add-to-list 'load-path "~/git/org-mode/contrib/lisp")

which is what I have:

  (add-to-list 'load-path "~/git/org-mode/lisp")
  (add-to-list 'load-path "~/git/org-mode/contrib/lisp/")
  (require 'org)

Maybe you have something earlier in your initialisation that brings in
the old version?  Have you done "make" in your ~/git/org-mode directory?

What happens if you start emacs with -Q, execute the lines above
and then visit your ledger org file?

--
: Eric S Fraga (0xFFFCF67D), Emacs 25.0.50.1, Org release_8.3beta-1062-gce4e64