From mboxrd@z Thu Jan  1 00:00:00 1970
From: Karl Voit <devnull@Karl-Voit.at>
Subject: Re: Wish: switch active time-stamps to inactive when CANCELED
Date: Fri, 18 Jan 2013 22:24:47 +0100
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* Nick Dokos <nicholas.dokos@hp.com> wrote:
>
> You can probably accomplish this with org-after-todo-state-change-hook:
>
> Write a function that checks if org-state is "CANCELED", and if so looks
> for active timestamps and calls org-toggle-timestamp-type on them.
>
> Then add the function to the hook.

Oh, I would have guessed this algorithm overview/principle as well
:-)

But unfortunately, I know that little of ELISP, that I am not able
to implement it by myself :-(

-- 
Karl Voit