See Nick's post for one possible solution:

http://blog.notdot.net/2009/9/Distributed-Transactions-on-App-Engine

On Sep 23, 10:50 am, hjo1620 <[email protected]> wrote:
> Background: I don't understand Datastore transactions.
>
> Containermanaged transactions in an JEE application server,
> makes it easy to write applications that have to
> for example, withdraw money from an account,
> and transfer into another account.
>
> If the withdrawal works but the transfer crashes,
> both withdrawal and eventual transfer changes are rolled back.
>
> How would I handle this kind of scenario with the Datastore ?
> Is it possible ? How ?
>
> /hw
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