Soyuz-Shuttle Schedule conflict in Sep '05?

A recent planning manifest for 2005
(http://www.spaceref.com/news/viewsr.html?pid=13498)
shows both a Russian Soyuz mission and a NASA shuttle mission overlapping.

Soyuz TMA-7 (11S) is set to launch September 27, 2005.

Space Shuttle mission 12A is scheduled for NET Sep 29.

Please advise me on the real constraints that ought to prevent this --
having two visiting crews
on the ISS is something we don't really ever want to do, true or false?

So this is just an uncoordinated 'best guess' about dates that will never be
allowed to happen?

This is fourteen months in the future -- but the Soyuz date is probably
pretty reliable,
just as the shuttle date is not.

How close, in general, are we allowed to plan Soyuz and Shuttle missions?

Thanks!

Jim O