Problem with 'ModelForm' vs 'Permission'

Dear All.

I've something like this :
--------START---------
class L2GroupForm(ModelForm):
    #Try to lock ForeignKey field to single value
    class Meta:
        model = L2Group
        widgets = {
            'company_id': TextInput(),
        }


class L2GroupAdmin(admin.ModelAdmin):
    #Choose the Form
    form = L2GroupForm()
    #Filtering Listed groups, only to which have right company_id
    def queryset(self, request):
        requserid =request.session.get('_auth_user_id', None)
        qs = self.model._default_manager.get_query_set()

        if not requserid is None :
            company_filter = L2User.objects.get(pk=requserid).company_id
            if not company_filter is None:
                qs = qs.filter(company_id=company_filter)
        print qs
        return qs

    #Try to set 'company_id' field initial value
    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        if db_field.name == 'company_id':
            requserid =request.session.get('_auth_user_id', None)
            if not requserid is None :
                company_filter = L2User.objects.get(pk=requserid).company_id
                if not company_filter is None:
                    kwargs['initial'] = company_filter
            return db_field.formfield(**kwargs)
        return super(L2GroupAdmin, self).formfield_for_foreignkey(
            db_field, request, **kwargs
        )

l2admin.register(L2Group, L2GroupAdmin)

--------STOP----------

Problem is :
1. When I loged in (as superuser), it says that I've no right to edit anything, but
2. When I commented the ' form = L2GroupForm()' , all is works but the company_id field not locked to single choice ... yes the initial value setup is work.

Kindly please give me your enlighten to lock a ForeignKey field to single choice.

Sincerely
-bino-

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