many-to-many between apps

Is it possible to establish a many-to-many relationship between a model
in one app and a model in another app?

I've just tried to do it and run into what I think is circular import
trouble. This is a retro-fit after initial deployment.

#in item.models.reference
class Reference(models.Model):
... various fields ...
class Meta:
app_label = 'item'

#in item.models.reference_region
from company import Region

class Reference_Region(models.Model):
region = models.ForeignKey(Region)
reference = models.ForeignKey(Reference)
class Meta:
app_label = 'item'


#in company.models.region
from item import Reference

class Region(models.Model):
... various fields ...
ref = models.ManyToManyField(Reference)

I have tried it the other way declaring the many-to-many field in
Reference and the same thing happens.

ImportError: cannot import name Reference
and
ImportError: cannot import name Region
respectively

Any ideas appreciated

Thanks

Mike

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