From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric S Fraga <ucecesf@ucl.ac.uk>
Subject: Re: how to unschedule a task in agenda view?
Date: Thu, 14 Jan 2010 13:00:47 +0000
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To: Manish <mailtomanish.sharma@gmail.com>
Cc: org-mode mailing list <emacs-orgmode@gnu.org>

At Thu, 14 Jan 2010 18:07:34 +0530,
Manish wrote:
> 
> There is a hook "org-after-todo-state-change-hook" that is called
> after the state of a TODO item is changed.  So may be org-schedule can
> be called to remove the SCHEDULED time on state change to WAITING?
> 
> http://orgmode.org/worg/org-configs/org-hooks.php#sec-1.13

This works like a charm:

--8<---------------cut here---------------start------------->8---
(add-hook 'org-after-todo-state-change-hook
	  '(lambda ()
	     ;; remove the scheduled date/time if present as the activity is no longer mine
	     ;; based on a suggestion by Manish on the org-mode mailing list
	     (if (string= state "WAITING") (org-schedule t))))
--8<---------------cut here---------------end--------------->8---

Thanks again,
eric