I played it once with the new silk road mechanic and tons of times before, but i never ran into that problem :/ I always thought this to be a sure thing. Khmer are exceptionally huge in that game, too... it's just a situation i never saw before. The idea isn't bad at all, but it's just dull as a concept if you can switch your gameplay for one turn to get the uhv. I got the trade-resources goal for Chola, maybe something along those lines? My initial idea was to get a certain revenue from trade, but dropped it halfway when i had troubles. I think i saw it in another modmod however.