Admin Inlines, unique_together, and updates?

Say I have a pair of classes roughly like so:

class Parent(models.Model):
name = models.CharField(maxlength=50)

class Child(models.Model):
parent = models.ForeignKey(Parent)
name = models.CharField(maxlength=50)
order = models.IntegerField()

class Meta:
unique_together = [['parent', 'order'],]

Say that I have one Parent and three children:

Parent:
name: "a parent"
Children:
parent: "a parent"; name: "child1"; order: 1
parent: "a parent"; name: "child2"; order: 2
parent: "a parent"; name: "child3"; order: 3

And that Child can be edited inline to Parent in the admin.

Now, say I want to change the order of the children to look like this:
parent: "a parent"; name: "child1"; order: 2
parent: "a parent"; name: "child2"; order: 1
parent: "a parent"; name: "child3"; order: 3

So I update the "order" fields in the inline, and try to save, but I
get an error for each of the updated children saying "Child with this
Parent and Order already exists" -- which makes sense because indeed
there are already children of that parent with orders 1 and 2... but
on the other hand is preventing me from updating them.

Any recommendations as to where to start in terms of working around
that?

Thanks!

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