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If you take a look at the Klang Valley Rail Transit Map, there is a missing link between Putrajaya and Puchong despite being geographically reasonably close to each other. Instead of backtracking to Bandar Tasik Selatan, there is a cheaper and faster way by bus, serving this missing link.
RapidKL Service 506 travels the route between Putrajaya Sentral and Puchong, Kelana Jaya and One Utama. Putrajaya Sentral is connected to the Putrajaya & Cyberjaya KLIA Transit Station.