django admin interface inlines placement

i wish means place an inline inbetween twin opposite fields fieldset. already foreignkeys, i figured inlining category i wanted defining additional forms trick, nonetheless apparently i a:

"class x" foreignkey "class y"

error. something upheld django 1.0? so, i controlling problem, there isn't pre-existing solution?

in models.py

class place(models.model):
    name = models.charfield(max_length=50)
    castle = models.charfield(max_length=80)

class owner(models.model):
    name = models.charfield(max_length=100)
    place = models.foreignkey(place)
    credentials = models.textfield()
    license_expiration = models.datetimefield('license expiration')

in admin.py

class placeinline(admin.tabularinline):  
    denote = place  
    additional = 5  

class owneradmin(admin.modeladmin):  
    fieldsets = [  
        (none,    {'fields': ['background','place', 'license_expiration']}),  
    ]  
    inlines = [placeinline]