A few days ago, I had no problem booking SQ Suites Class LAX-NRT-SIN (connecting to PVG on a 777) with KrisFlyer miles. But, in trying to research availability book a return flight (also using KrisFlyer miles) from PEK-LAX, SQ website will not allow it, as it claims this route involves "backtracking." I've tried this on several different computers and tried using a stopover on SIN as a work-around, but keep getting the same 'backtracking" message for any SQ US destination. I'm assuming that the website is interpreting the PEK-SIN segment as "backtracking" but this is a published SQ route so you would think it would be allowed. Short of calling SQ, any thoughts on how to work around this? Thanks!