ManyToManyField and Multi Table Inheritance

Hi,

I've run into interesting issue and I'm not sure if I do something wrong or this is Django issue. I'm using Multi Table Inheritance:

<code>

from django.db import models

from django import forms

class AccountType(models.Model):

    users = models.ManyToManyField('auth.User', related_name='accounts')

class AccountTypeA(AccountType):

    name = models.CharField(max_length=255)

class AccountTypeAForm(forms.ModelForm):

    class Meta:

        model = AccountTypeA

        fields = ('name', 'users')

</code>

However, users are not saved in database. Find out that ModelForm calls `self.instance.users = <list-of-users>` but that's not get saved. Even 

<code>

account = AccountTypeA(name='something')

account.save()

account.users = User.objects.all()

</code>

is not propagated. However, account.accounttype.users works perfectly fine. Do I do something wrong?

P.S: I'm using Django 1.6

Izidor

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