When no other module is installed, no change of behaviour (check_move returns None, always True) When stock_location is installed, depending of the order of evaluation of the conditions, could go to ready without passing by move activity, avoid this Courtesy of Mohammad Alhashash lp bug: https://launchpad.net/bugs/1193779 fixed bzr revid: mat@openerp.com-20131114162553-5yzgp4hy9dqdan5t