I set up my capture template as follows:
(setq org-capture-templates
  '(("t" "Todo" entry (file+headline "~/repo/org/refile.org" "Task")
 "* TODO %?\n %i%T\n %i%U\n %a\n" :clock-in t :clock-resume t)
("n" "Note" entry (file "~/repo/org/refile.org")
 "* %?\n %U\n %a\n :CLOCK:\n :END:" :clock-in t :clock-resume t)
("r" "Routine" entry (file+datetree+prompt "~/repo/org/x.org")
 "* Content ommited")
))
and I expect it prompt out an inbox for me to select date after I recall
org-capture and choose "r". But it turns out "file+datetree+prompt" is
not a valid value for target. Emacs simple returns an error message:
"Invalid time specification".

Did I miss something? Or did I just found a bug?

Thank you guys in advance :)

Emacs  : GNU Emacs 23.2.1 (i686-pc-linux-gnu, GTK+ Version 2.22.1)
 of 2011-03-06 on zzz-laptop
Package: Org-mode version 7.4

-- 
Best Regards,
Zhang Zhizhong
Department of Computer Science
Sun Yat-sen University