makeing a foreign key optional

Hey,

i want to have an optional foreign key in my model. I tried sth like
this:
person = models.ForeignKey('Person',
related_name="kontakt",blank=True,null=True)
If I try to add a new object in the admin interface it is always
complaining that i have no value selected in the person field.

What am I doing wrong here?

Thx
Sebastian

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