very simple example, if phase is closed or withdrawn, then set state to closed:
condition: current.phase_state.changesTo('closed') || current.phase_state.changesTo('withdrawn')
script:
current.active=false;
if (current.phase_state.changesTo('closed'))
{current.state = 3;}
if (current.phase_state.changesTo('withdrawn'))
{current.state = 7;}
