Universal Dock iPhone 3G mb125g vs. MB125GB

I have a mb125g/A, that is the newer style universal dock with remote (no s-video output; narrow IR receiver). I see Apple has changed the part number to mb125g/B; the only difference that Ive read about so far is that the /B may include a 4th gen Nano adapter. My issue is, when I plug in the iPhone 3G, I get a Device not made to work with iPhone; would you like to turn on Airplane mode? message on the iPhone, and I have to hit OK, then it continues to work just fine, charging, audio out works, the remote works. So why does it display this message? Whats the point of having a $50 universal dock, if its not compatible with future items? Thats a lot of money to spend on something thats going to be obsolete (or a pain to use) next time hardware is refreshed.Does the mb125g/B fix this?Rob iPhone 3G