On ExpertFlyer I found the fare code RLSSOWSG for SIN-SYD on 12/26/05 on QF. It is a one-way fare. In the fare rules, it says unlimited stopovers are permitted.

I've tried booking a multi-city trip from SIN-SYD-PER-SIN (with itn.net), on flights which have availibility in the R class. Here are the flights I chose.

12/26/05 QF32 SIN-SYD 09:00-19:25
12/29/05 QF575 SYD-PER 08:25-10:10
12/31/05 QF77 PER-SIN 11:25-16:25

I thought that this would be a SIN-SYD round trip with a stopover in PER on the way back. But it's pricing as with a fare code in the K class (1st segment), S class (2nd segment), and K class (last segment). I suspect I'm missing something in my interpretation of the fare rules. Can someone help me out and explain why I'm not getting the RLSSOWSG fare?

Thanks!