问题是如果要设定不同的返回地点,那么根据官网上说的,就只能在站里或者火车上买了: http://www.b-rail.be/nat/E/tarifs/tickets/weekend/
In addition, you can return from a station other than the one where your outward journey ended, as long as you mention this when you're buying your ticket. (only possible for Weekend tickets purchased in a station and on the train).