Just checked out of St Regis Beijing. Used my CSP, asked to turn off DCC, got the charge in CNY.
The POS is BoC. Looks like all BoC terminals at major Western hotels in Beijing can do the same thing, by hitting Cancel button right after entering amount.
Also notices, BoCommunication terminals are disappearing??? Interesting that all the Western hotels I've been to in Beijing in the recent two years all use BoC terminals at the front desk. In their restaurants however, BoCommunication terminals are prevalent.