I figure it out, I am updating the variable that causes problems and it
is working very well so in case you want to use org-edit-src-code in
Message mode all is needed is:
#+BEGIN_SRC emacs-lisp
(eval-after-load "message"
'(progn
(define-key message-mode-map (kbd "<tab>")
(lambda ()
(interactive)
(if (not (org-try-structure-completion))
(message-tab))))
(define-key message-mode-map (kbd "C-c '")
(lambda ()
(interactive)
(org-edit-src-code)
(setq-local org-edit-src-from-org-mode t)))))
#+END_SRC
I just used it right now =)
Jorge.
