Problema con ForeignKeys hacia una tabla abstracta

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Buenas tardes a todos;

Quiero tener ForeignKeys hacia el modelo padre en las tablas intermedias
(manytomany trough) para tener entradas únicas en las mismas.

El problema es que quiero que este modelo padre sea abstract, ya que
nunca querré instanciarlo, utilizando DomainOwned o DomainPending en vez
de esta.

El error que tengo es este:

File "/home/ferran/intranet/domains/models.py", line 48,
in ContactType
domain = models.ForeignKey(DomainUbi)
File
"/usr/lib/python2.7/site-packages/django/db/models/fields/related.py",
line 808, in __init__
assert not to._meta.abstract, "%s cannot define a relation with
abstract class %s" % (self.__class__.__name__, to._meta.object_name)
AssertionError: ForeignKey cannot define a relation with abstract
class DomainUbi

En las foreignkeys a DomainUbi, tanto en ContactType como en
AssociatedNameServer.

Había pensado que podría implementar los fields ns y contacts en ambas
tables (DomainOwned y DomainPending), utiliando generic relationships,
pero no me parece correcto.

Alguien me puede echar una mano?
- ---

class DomainMinimal(models.Model):
sld = models.CharField(
max_length=63
)
tld = models.ForeignKey(common.Tld)
name = property('_domain_name')

def _domain_name(self):
return u'%s.%s' % (self.sld, self.tld)

def __unicode__(self):
return self.name

class Meta:
abstract = True

class DomainUbi(DomainMinimal):
owner = models.ForeignKey(contacts.Contact, related_name='Owner')
contacts = models.ManyToManyField(contacts.Contact,
through='ContactType')
ns = models.ManyToManyField('NameServer',
through='AssociatedNameServer')
period = models.IntegerField(validators=[MaxValueValidator(10)])

class Meta:
abstract = True

class DomainOwned(DomainUbi):
crdate = models.DateField()
exdate = models.DateField()

class DomainPending(DomainUbi):
status = None # just an example, now

class ContactType(models.Model):
contact = models.ForeignKey(contacts.Contact)
domain = models.ForeignKey(DomainUbi)
role = models.CharField(
max_length=10,
choices = (
('admin', 'Administratiu'),
('billing', 'Facturacio'),
('tech', 'Tecnic'),
)
)
class Meta:
unique_together = ('contact', 'domain', 'role')

class AssociatedNameServer(models.Model):
ns = models.ForeignKey('NameServer')
domain = models.ForeignKey(DomainUbi)
priority = models.IntegerField(
validators=[MaxValueValidator(4)]
)
def __unicode__(self):
return "%s (%s)" % (self.ns.host, self.ns.ip)

class Meta:
unique_together = ('ns', 'domain', 'priority')

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