[O] Refile not working as desired

[Michael Ziems]

Hello,

i am using the following in my .emacs:

 (setq org-refile-use-outline-path 'file)
 (setq org-refile-targets '((org-agenda-files :level . 4)))

i would now like to drop a certain headline when pressing C-c C-w anywhere:

maybe directly in:

work.org as first headline
work.org/routine/customerABC/
or maybe
work.org/routine/customerABC/Calls/meeting20150217/notes/whatever

but ord mode is only allowing me to go exactly to one level deep (i 
assume level 4)
but when i leave:

 (setq org-refile-targets '((org-agenda-files :level . 4))) out

it is still not allowing it.

Do you have any idea, what could be the reason?