Is there a way of forcing NHibernate to do inserts/updates on certain relationships first? Like some sort of priority?

Say I have a mapping for object Foo like this:

<class name="Foo">
<id> ... </id>

<bag name="bar"> ... </bag>
<bag name="meh"> ... </bag>

</class>

Now say there is a legacy schema in place that has a foreign key where FooMeh depends on the key in FooBar, not foo. So in this example, an insert to Meh would depend on an insert to Bar before-hand.

There is no logical way that I can change my mappings to reflect the foreign key (that I can think of). I figured Nhib would issue the insert on Bar first since it's first in the mapping file, but that's not the case.

I'm using NHibernate 1.0.2