diff --git a/cotisations/admin.py b/cotisations/admin.py
index 821e82b0..cbad4542 100644
--- a/cotisations/admin.py
+++ b/cotisations/admin.py
@@ -3,10 +3,10 @@ from django.contrib import admin
 from .models import Facture, Article, Banque, Paiement, Cotisation, Vente
 
 class FactureAdmin(admin.ModelAdmin):
-    list_display = ('user','paiement','number', 'date','valid')
+    list_display = ('user','paiement','date','valid')
 
 class VenteAdmin(admin.ModelAdmin):
-    list_display = ('facture','name','prix','cotisation','duration')
+    list_display = ('facture','name','prix','number','cotisation','duration')
 
 class ArticleAdmin(admin.ModelAdmin):
     list_display = ('name','prix','cotisation','duration')
diff --git a/cotisations/forms.py b/cotisations/forms.py
index bf323602..c3a484c0 100644
--- a/cotisations/forms.py
+++ b/cotisations/forms.py
@@ -4,8 +4,6 @@ from django import forms
 from .models import Article, Paiement, Facture, Banque, Vente
 
 class NewFactureForm(ModelForm):
-    article = forms.ModelMultipleChoiceField(queryset=Article.objects.all(), label="Article", widget=forms.CheckboxSelectMultiple())
-
     def __init__(self, *args, **kwargs):
         super(NewFactureForm, self).__init__(*args, **kwargs)
         self.fields['cheque'].required = False
@@ -23,13 +21,15 @@ class NewFactureForm(ModelForm):
         paiement = cleaned_data.get("paiement")
         cheque = cleaned_data.get("cheque")
         banque = cleaned_data.get("banque")
-        if paiement.moyen=="chèque" and not (cheque and banque):
+        if not paiement:
+            raise forms.ValidationError("Le moyen de paiement est obligatoire")
+        elif paiement.moyen=="chèque" and not (cheque and banque):
             raise forms.ValidationError("Le numero de chèque et la banque sont obligatoires")
         return cleaned_data
 
 class SelectArticleForm(Form):
-    article = forms.ModelChoiceField(queryset=Article.objects.all(), label="Article")
-    quantity = forms.IntegerField(label="Quantité")
+    article = forms.ModelChoiceField(queryset=Article.objects.all(), label="Article", required=True)
+    quantity = forms.IntegerField(label="Quantité", required=True)
 
 class NewFactureFormPdf(Form):
     article = forms.ModelMultipleChoiceField(queryset=Article.objects.all(), label="Article")
diff --git a/cotisations/migrations/0014_auto_20160712_0245.py b/cotisations/migrations/0014_auto_20160712_0245.py
new file mode 100644
index 00000000..b71385bf
--- /dev/null
+++ b/cotisations/migrations/0014_auto_20160712_0245.py
@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cotisations', '0013_auto_20160711_2240'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='facture',
+            name='number',
+        ),
+        migrations.AddField(
+            model_name='vente',
+            name='number',
+            field=models.IntegerField(default=1),
+            preserve_default=False,
+        ),
+    ]
diff --git a/cotisations/models.py b/cotisations/models.py
index aa002c33..71513a42 100644
--- a/cotisations/models.py
+++ b/cotisations/models.py
@@ -6,7 +6,6 @@ class Facture(models.Model):
     paiement = models.ForeignKey('Paiement', on_delete=models.PROTECT)
     banque = models.ForeignKey('Banque', on_delete=models.PROTECT, blank=True, null=True)
     cheque = models.CharField(max_length=255, blank=True)
-    number = models.IntegerField()
     date = models.DateTimeField(auto_now_add=True)
     valid = models.BooleanField(default=True)
 
@@ -15,7 +14,7 @@ class Facture(models.Model):
         return prix
 
     def prix_total(self):
-        return self.prix()*self.number
+        return Vente.objects.all().filter(facture=self).aggregate(total=models.Sum(models.F('prix')*models.F('number'), output_field=models.FloatField()))['total']
 
     def name(self):
         name = ' - '.join(vente.name for vente in Vente.objects.all().filter(facture=self))
@@ -26,11 +25,15 @@ class Facture(models.Model):
 
 class Vente(models.Model):
     facture = models.ForeignKey('Facture', on_delete=models.PROTECT)
+    number = models.IntegerField()
     name = models.CharField(max_length=255)
     prix = models.DecimalField(max_digits=5, decimal_places=2)
     cotisation = models.BooleanField()
     duration = models.IntegerField(help_text="Durée exprimée en mois entiers", blank=True, null=True)
 
+    def prix_total(self):
+        return self.prix*self.number
+
     def __str__(self):
         return str(self.name) + ' ' + str(self.facture)
 
diff --git a/cotisations/templates/cotisations/facture.html b/cotisations/templates/cotisations/facture.html
index 50721ef7..659c3dce 100644
--- a/cotisations/templates/cotisations/facture.html
+++ b/cotisations/templates/cotisations/facture.html
@@ -1,5 +1,6 @@
 {% extends "cotisations/sidebar.html" %}
 {% load bootstrap3 %}
+{% load staticfiles%}
 
 {% block title %}Création et modification de factures{% endblock %}
 
@@ -9,10 +10,33 @@
 <form class="form" method="post">
     {% csrf_token %}
     {% bootstrap_form factureform %}
-    {% for vente in venteform %}
-    {% bootstrap_form vente %}
-    {% endfor %}
     {{ venteform.management_form }}
+    <div id="form_set">
+    {% for form in venteform.forms %}
+            {{ form.as_p }}
+    {% endfor %}
+    </div>
+    <input class="btn btn-primary btn-sm" role="button" value="Ajouter un article" id="add_one">
+    <input class="btn btn-primary btn-sm" role="button" value="Supprimer un article" id="del_one">
     {% bootstrap_button "Créer ou modifier" button_type="submit" icon="star" %}
 </form>
+
+<div id="empty_form" style="display:none">
+    <table class='no_error'>
+        {{ venteform.empty_form.as_p }}
+    </table>
+</div>
+
+<script>
+    $('#add_one').click(function() {
+        var form_idx = $('#id_form-TOTAL_FORMS').val();
+        $('#form_set').append($('#empty_form').html().replace(/__prefix__/g, form_idx));
+        $('#id_form-TOTAL_FORMS').val(parseInt(form_idx) + 1);
+    });
+    $('#del_one').click(function() {
+        var forms = $('.dynamic-form');
+        $('#id_form-TOTAL_FORMS').val(forms.length);
+    });
+</script>
+
 {% endblock %}
diff --git a/cotisations/views.py b/cotisations/views.py
index 19d9dca0..3f90417a 100644
--- a/cotisations/views.py
+++ b/cotisations/views.py
@@ -12,7 +12,7 @@ from django.forms import modelformset_factory, formset_factory
 import os
 
 from .models import Facture, Article, Vente, Cotisation, Paiement, Banque
-from .forms import NewFactureForm, EditFactureForm, ArticleForm, DelArticleForm, PaiementForm, DelPaiementForm, BanqueForm, DelBanqueForm, NewFactureFormPdf
+from .forms import NewFactureForm, EditFactureForm, ArticleForm, DelArticleForm, PaiementForm, DelPaiementForm, BanqueForm, DelBanqueForm, NewFactureFormPdf, SelectArticleForm
 from users.models import User
 from .tex import render_tex
 from re2o.settings_local import ASSO_NAME, ASSO_ADDRESS_LINE1, ASSO_ADDRESS_LINE2, ASSO_SIRET, ASSO_EMAIL, ASSO_PHONE, LOGO_PATH
@@ -47,22 +47,28 @@ def new_facture(request, userid):
         return redirect("/cotisations/")
     facture = Facture(user=user)
     facture_form = NewFactureForm(request.POST or None, instance=facture)
-    ArticleFormSet = formset_factory(ArticleForm)
-    if facture_form.is_valid():
+    article_formset = formset_factory(SelectArticleForm)
+    article_formset = article_formset(request.POST or None)
+    if facture_form.is_valid() and article_formset.is_valid():
         new_facture = facture_form.save(commit=False)
-        article = facture_form.cleaned_data['article']
-        new_facture.save()
-        for art in article:
-            new_vente = Vente.objects.create(facture=new_facture, name=art.name, prix=art.prix, cotisation=art.cotisation, duration=art.duration, number=1)
-            new_vente.save()
-        if any(art.cotisation for art in article):
-            duration = sum(art.duration for art in article if art.cotisation)
-            create_cotis(new_facture, user, duration)
-            messages.success(request, "La cotisation a été prolongée pour l'adhérent %s " % user.name )
-        else:
-            messages.success(request, "La facture a été crée")
-        return redirect("/users/profil/" + userid)
-    return form({'factureform': facture_form}, 'cotisations/facture.html', request)
+        articles = article_formset
+        if any(art.cleaned_data for art in articles):
+            new_facture.save()
+            for art_item in articles:
+                if art_item.cleaned_data:
+                    article = art_item.cleaned_data['article']
+                    quantity = art_item.cleaned_data['quantity']
+                    new_vente = Vente.objects.create(facture=new_facture, name=article.name, prix=article.prix, cotisation=article.cotisation, duration=article.duration, number=quantity)
+                    new_vente.save()
+            if any(art.cleaned_data['article'].cotisation for art in articles):
+                duration = sum(art.cleaned_data['article'].duration*art.cleaned_data['quantity'] for art in articles if art.cleaned_data['article'].cotisation)
+                create_cotis(new_facture, user, duration)
+                messages.success(request, "La cotisation a été prolongée pour l'adhérent %s " % user.name )
+            else:
+                messages.success(request, "La facture a été crée")
+            return redirect("/users/profil/" + userid)
+        messages.error(request, u"Il faut au moins un article valide pour créer une facture" )
+    return form({'factureform': facture_form, 'venteform': article_formset}, 'cotisations/facture.html', request)
 
 @login_required
 @permission_required('trésorier')