Foreign key filter question

I have a table that has these 2 foreign keys:

target_name = models.ForeignKey(Target)
wafer = models.ForeignKey(Wafer)

Both Target and Wafer are defined the same:

name = models.CharField(max_length=40, db_index=True, unique=True)

When filtering by wafer I can do this:

wafer__name__icontains='foo'

But when I try to do the same with target, if I do this:

target__name__icontains='foo'

I get:

FieldError Cannot resolve keyword 'target' into field. And in the
choices it shows:

target_name

And if I do:

target_name__icontains='foo'

I get:

Related Field has invalid lookup: icontains

How can I do foreign key filtering using icontains on this field?

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