In my org file, I have ordered capital lettered plain lists like this:

A. Item A
B. Item B
a. subitem a
b. submitem b
C. Item C

But when I export them to a pdf via latex, they look like this:

1. Item A
2. Item B
(a) subitem a
(b) submitem b
3. Item C

Is this a bug or is it expected behavior?

--- test .org file ----------------

A. Item A

B. Item B

a. subitem a

b. submitem b

C. Item C

-- my setup --------------------

Emacs : GNU Emacs 25.1.1 (i686-w64-mingw32)

of 2016-09-17

Package: Org mode version 9.0.1 (9.0.1-elpa @ c:/Users/scott/OneDrive/scotto/.emacs.d/elpa/org-20161118/)