the Trouble shooting chart referenced above, does metion this posiblity on the TTL equiped X series. (X500 or X570 or X 700) it seems like the flash itself is the one that commands the second curtain, when the Camera detects that it is talking to a dedicated Minolta Flash. A bit weird, BUT I can see that that would allow for a future model to do things like second curtain sync. (wait some time after curtain open, and then fire and close second curtain)
X500 sold in Europe, and x570 sold in North america, otherwise almost identical although I am not sure if both the chrome and black versions were in all Markets) )