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Problems with submit button in change_form template Django
class Product(models.Model):
    product_name= models.CharField(max_length=50)
    price = models.DecimalField(max_digits=10, decimal_places=2, default=Decimal('0.00'))
    tax_per_item = models.DecimalField(max_digits=10, null=True, blank=True, decimal_places=2, default=Decimal('0.00'))
    discount_per_item = models.DecimalField(max_digits=10, null=True, blank=True, decimal_places=2, default=Decimal('0.00'))


class Order(models.Model):
    produks = models.ManyToManyField(Product, verbose_name=u"Kode Produk")
    no_customer = models.ForeignKey(Customer, null=True, blank=True, related_name='%(class)s_kode_cust')

    def order_view(request):
        if 'enter' in request.POST:
            #response to tabular.html template
            return HttpResponseRedirect('/admin/POS/Pemesanan/inline')

class Foo(models.Model):
    product = models.ForeignKey(Product, editable=False)
    pemesanan = models.ForeignKey(Order)
    quantity = models.IntegerField()
    price = models.IntegerField()
    discount = models.IntegerField()
    tax = models.IntegerField()

class PemesananAdmin(admin.ModelAdmin):
fieldsets = (
    ('Customer in Time (Person)', {
        'fields': ('no_customer',),
    }),
    ('Date', {
        'fields' : ('date', 'delivery_date',),
    }),
    ('Order Details', {
        'fields' : ('produks',),
    }),
)
search_fields = ['produks', 'no_customer']
raw_id_fields = ('produks', 'no_customer',)
related_lookup_fields = {
'fk': ['no_customer'],
'm2m': ['produks'],
}
inlines = [
    FooInline,
]

class FooInline(admin.TabularInline):
model = Foo
template = 'admin/POS/Pemesanan/inline/tabular.html'
extra = 0
allow_add = True

{% extends "admin/change_form.html" %}
{% block after_field_sets %}{{ block.super }}

<form action="" method="post">
<input type="submit" name="enter" value="Enter" />
</form>
{% endblock %}

<form action="" method="post">
<input type="submit" name="enter" value="Enter" />
</form>

class Product(models.Model):
   ...

class Order(models.Model):
   products = models.ManyToManyField(Product, through='Item')

class Item(models.Model):
   order = models.ForeignKey(Order)
   product = models.ForeignKey(Product)
   quantity = models.IntegerField()
   ...

class ItemInline(admin.TabularInline):
    model = Item

class OrderAdmin(admin.ModelAdmin):
    inlines = (ItemInline,)