single entry visa but need to fly back into china due to a change in flight arrangments

I have a single entry visa which covers my time from Hong Kong to Beijing. I have just been informed that my flight from Japan ( osaka) to Manila requires a 24 hour stop over in China. Do i therefore require a double entry? or am i classed as in transit within 24 hours? Also the airline has offered to pay for accomodation due to the change in flight plan however as i then classed as being in the country even though it would be at the airport?