ModelAdmin.has_change_permission gives 403

From the docs ...

https://docs.djangoproject.com/en/1.6/ref/contrib/admin/#django.contrib.admin.ModelAdmin.has_change_permission

... is working nicely except it just pops up a standard error page 403
Forbidden when it returns False.

How can I intercept this in the Admin and treat it like an error
displayed like all the other validation errors generated from the
model.clean() method???

I'd like to raise a business rule violation exception on saving the model.

Thanks for any hints

Mike

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