inserting inlines to an specific admin class affects all of them

Hi!
I have a plugin style app that adds "support" for PHP (inserting two
admin inlines) into VirtualHostAdmin class, I use this code for the
job:

admin.site.unregister(VirtualHost)
ix = len(VirtualHostAdmin.inlines)
VirtualHostAdmin.inlines.insert(ix, PHPVersionInline)
VirtualHostAdmin.inlines.insert(ix+1, VirtualHostPHPOptionInline)
admin.site.register(VirtualHost, VirtualHostAdmin)

I don't know why but this inserts the PHPVersionInline and
VirtualHostPHPOptionInline into ALL of my admin models without an
admin inline defined. For example:

print "admin model who haven't nothing to do with VirtualHost and have
NO inlines"
[<class 'ucp.php.admin.PHPVersionInline'>, <class
'ucp.php.admin.VirtualHostPHPOptionInline'>]

print "admin model who haven't nothing to do with VirtualHost and have
inlines defined"
[<class 'ucp.pricing.admin.RateInline'>]

consequently, when I try to load a change_forma for
ucp.pricing.models.Pack django servers raise this exeption:
<class 'ucp.php.models.PHPVersion'> has no ForeignKey to <class
'ucp.pricing.models.Pack'>

Any clue about what's going on here?

Thanks!
--
Marc

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