Originally Posted by
JPDM
I don't remember any but I remember reports from travelers who were not compliant and denied entry who had to book a flight to get out of China "now".
This is my understanding as well. Friends of mine who were incorrectly allowed boarding in HKG for TWOV (on a HKG-PVG-HKG itinerary) were required to book an immediate flight out of China on arrival, which was a last minute walk up fare to the USA.