Export settings in subtree level with org-koma-letter

["Sébastien Gendre" <seb@k-7.ch>]

Hello,

I try to use Org-mode and org-koma-letter to make letters.

I want to have one file where each first level headline as a letter. So,
I tried to define the export settings of org-koma-letter as headline
properties. With no success.


Here is an example:

#+begin_src org

* Example of letter
:PROPERTIES:
:LANGUAGE: en
:AUTHOR: Me
:FROM_ADDRESS: 4 place of nowhere
:EMAIL: me@example.com
:PHONE_NUMBER: 000-000-000
:TO_ADDRESS: Someone, 4 place somewhere
:OPENING: Hello,
:CLOSING: Bye.
:DATE: \today
:PLACE: Here
:OPTIONS: foldmarks:nil phone:t email:t
:END:

This is a test of text, a test of text, a test of text, a test of
text, a test of text, a test of text, a test of text, a test of text,
a test of text, a test of text, a test of text, a test of text, a test
of text, a test of text, a test of text, a test of text, a test of
text, a test of text, a test of text, a test of text, a test of text,
a test of text, a test of text, a test of text, a test of text, a test
of text, a test of text, a test of text, a test of text, a test of
text, a test of text, a test of text, a test of text, a test of text,
a test of text, a test of text, a test of text, a test of text.


* Another example of letter
:PROPERTIES:
:LANGUAGE: en
:AUTHOR: Not me
:FROM_ADDRESS: 5 place of nowhere
:EMAIL: not-me@example.com
:PHONE_NUMBER: 000-000-001
:TO_ADDRESS: Someone, 5 place somewhere
:OPENING: Hello there,
:CLOSING: I'll be back.
:DATE: \today
:PLACE: There
:OPTIONS: foldmarks:nil phone:t email:t
:END:

This is not a test of text, not a test of text, not a test of text, not a test of
text, not a test of text, not a test of text, not a test of text, not a test of text,
not a test of text, not a test of text, not a test of text, not a test of text, not a test
of text, not a test of text, not a test of text, not a test of text, not a test of
text, not a test of text, not a test of text, not a test of text, not a test of text,
not a test of text, not a test of text, not a test of text, not a test of text, not a test
of text, not a test of text, not a test of text, not a test of text, not a test of
text, not a test of text, not a test of text, not a test of text, not a test of text,
not a test of text, not a test of text, not a test of text, not a test of text.

#+end_src

After an export with ~(org-koma-letter-export-to-pdf nil t)~, in the
resulted PDF, only the author and date are set.

Do I do something wrong ?

Emacs version: 28.2
Orgmode version: 9.5.5



Best regards.