`bzr pull . -rXXX` does not work in subdir

[Alexander Belchenko]

C:\work\Bazaar\plugins\qbzr\lib>bzr uncommit --force
  734 Alexander Belchenko 2009-05-29
      qannotate: set focus on main widget (with annotated text)

The above revision(s) will be removed.
You can restore the old tip by running:
  bzr pull . -r revid:<email address hidden>

C:\work\Bazaar\plugins\qbzr\lib>bzr pull . -r revid:<email address hidden>
bzr: ERROR: Not a branch: "C:/work/Bazaar/plugins/qbzr/lib/".

C:\work\Bazaar\plugins\qbzr\lib>cd ..
C:\work\Bazaar\plugins\qbzr>

C:\work\Bazaar\plugins\qbzr>bzr pull . -r revid:<email address hidden>
All changes applied successfully.
Now on revision 734.

bzr 1.15.

Maybe the bug occurs because I'm working in lightweight checkout.