no plus-sign to add related object in admin

I've got a project where when I pull up the admin page to add an
object (an object that has several foreign keys), some of the FK
fields show the little green plus-sign links to add a new related
object for that field and other FK fields do not.

In the past, I've seen the plus-sign link to add a new related object
on all of the FK fields. Why would it not show up?

I'm using Django 1.2.5.

K.C.

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