How do I filter an InlineModelAdmin ForeignKey?

I'd like PartnerRegistration's default_provider field to be filtered in PartnerRegistrationInline, like how Partner's default_provider field is filtered in PartnerAdmin.

When I try the code below, I get a DoesNotExist exception in:

self.fields['default_provider'].queryset = self.instance.partner.providers

raise self.field.rel.to.DoesNotExist

What am I doing wrong?

class Partner(Model):
id = UUIDField(primary_key=True)
providers = ManyToManyField('Provider', related_name='provider_partners', blank=True, null=True)
default_provider = ForeignKey('Provider', null=True, blank=True, help_text='The calling service used to make calls through by default when using this partner')

class PartnerForm(forms.ModelForm):
""" Filter and only show what belongs to this partner."""

def __init__(self, *args, **kwargs):
super(PartnerForm, self).__init__(*args,**kwargs)
self.fields['default_provider'].queryset = self.instance.providers

class PartnerRegistration(Model):
id = UUIDField(primary_key=True)
partner = ForeignKey('Partner',unique=True)
default_provider = ForeignKey('Provider',verbose_name='default calling service', help_text='User this calling service when response doesn\'t specify one.')

class PartnerRegistrationForm(forms.ModelForm):
""" Filter and only show what belongs to this partner."""

def __init__(self, *args, **kwargs):
super(PartnerRegistrationForm, self).__init__(*args,**kwargs)
self.fields['default_provider'].queryset = self.instance.partner.providers

class PartnerRegistrationInline(StackedInline):
model = PartnerRegistration
form = PartnerRegistrationForm

class PartnerAdmin(ModelAdmin):
form = PartnerForm

inlines = [ PartnerRegistrationInline, ]

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