Originally Posted by
spk307
Given the lack of detail, I assume you are looking at IST-SIN-MLE on SQ which IS backtracking.
As others have mentioned, try to book on star alliance carriers such as TK using Krisflyer miles.
Actually I was looking at TK operated flights OR-IST-MLE not SQ operated flights. When I searched the individual leg (ORD-IST and IST-MLE both operated by TK), both legs are available but the agent was not able to book as one award.