The documentation appears to be correct - I got an invalid-from-address error when I sent a request with "from" address set to type Address. The error went away when I force-changed it to type "ComposeAddress".
Can you confirm this and is it possible to get an updated WSDL?
Anyone?? Any feedback at all from Yahoo forum reps? So far I have a 100% of my questions ignored by Yahoo (and I don't think I ask nonsensical or inappropriate questions). I'd stop wasting my time here, except I know of no other forum at all where such questions can be asked and answered!