It should be possible, you did the exact same process as you would do on the map? and on the map it works?
heyho, yes on map it works. i read on some other plugins which function quite the same that it is not possible when an event is happening except parallel. i think it doenst work because of the battle itself. on map when a parallel event is running it works fine but the battle "interrupts" it i think.
still, a great plugin ^^