Key bindings for org calendar selection

[Florian Lindner]

This is a cross-post from emacs.orgmode, since I got no replies for 3 weeks.

Hello,

the usual emacs calendar (M-x calendar) can be controlled using these key 
bindings:
https://www.gnu.org/software/emacs/manual/html_node/emacs/Calendar-Unit-Motion.html

But how can the calendar be controlled when invoked by org-mode, e.g. by C-c 
C-s to set a scheduled date on an entry?
The key bindings from standard calendar do not work, neither editing the mini 
buffer works out.

Thanks,
Florian