Originally Posted by
starlagurl
If necessary, can I use the "72 hour transit" visa to avoid any fine or bad record on my immigration file?
The 72-hour TWOV would not be valid if you are originating in China.
If you were originating outside China (say Japan) but flying to Beijing and then Guangzhou, the dual stops limit you to a 24 hour TWOV, measured from your scheduled time of arrival into PEK until your scheduled departure time from CAN.
Either follow
mosburger's advice, or change your flights out of PEK.