diff --git a/bda/models.py b/bda/models.py
index a405a665..df73a209 100644
--- a/bda/models.py
+++ b/bda/models.py
@@ -315,10 +315,11 @@ class SpectacleRevente(models.Model):
             # Envoie un mail aux perdants
             for inscrit in inscrits:
                 if inscrit != winner:
-                    context['acheteur'] = inscrit.user
+                    new_context = dict(context)
+                    new_context['acheteur'] = inscrit.user
                     datatuple.append((
                         'bda-revente-loser',
-                        context,
+                        new_context,
                         settings.MAIL_DATA['revente']['FROM'],
                         [inscrit.user.email]
                     ))
diff --git a/gestioncof/petits_cours_views.py b/gestioncof/petits_cours_views.py
index 95fdf3b7..332e156c 100644
--- a/gestioncof/petits_cours_views.py
+++ b/gestioncof/petits_cours_views.py
@@ -215,7 +215,7 @@ def _traitement_other(request, demande, redo):
     proposals = proposals.items()
     proposed_for = proposed_for.items()
     return render(request,
-                  "gestiocof/traitement_demande_petit_cours_autre_niveau.html",
+                  "gestioncof/traitement_demande_petit_cours_autre_niveau.html",
                   {"demande": demande,
                    "unsatisfied": unsatisfied,
                    "proposals": proposals,
diff --git a/kfet/management/commands/createopes.py b/kfet/management/commands/createopes.py
new file mode 100644
index 00000000..77663b2b
--- /dev/null
+++ b/kfet/management/commands/createopes.py
@@ -0,0 +1,175 @@
+
+"""
+Crée des opérations aléatoires réparties sur une période de temps spécifiée
+"""
+
+import random
+from datetime import timedelta
+from decimal import Decimal
+from django.utils import timezone
+from django.core.management.base import BaseCommand
+
+from kfet.models import (Account, Article, OperationGroup, Operation,
+                         Checkout, Transfer, TransferGroup)
+
+
+class Command(BaseCommand):
+    help = "Crée des opérations réparties uniformément sur une période de temps"
+
+    def add_arguments(self, parser):
+        # Nombre d'opérations à créer
+        parser.add_argument('opes', type=int,
+                            help='Number of opegroups to create')
+
+        # Période sur laquelle créer (depuis num_days avant maintenant)
+        parser.add_argument('days', type=int,
+                            help='Period in which to create opegroups')
+
+        # Optionnel : nombre de transfert à créer (défaut 0)
+        parser.add_argument('--transfers', type=int, default=0,
+                            help='Number of transfers to create (default 0)')
+
+
+    def handle(self, *args, **options):
+
+        self.stdout.write("Génération d'opérations")
+
+        # Output log vars
+        opes_created = 0
+        purchases = 0
+        transfers = 0
+
+        num_ops = options['opes']
+        num_transfers = options['transfers']
+        # Convert to seconds
+        time = options['days'] * 24 * 3600
+
+        checkout = Checkout.objects.first()
+        articles = Article.objects.all()
+        accounts = Account.objects.exclude(trigramme='LIQ')
+        liq_account = Account.objects.get(trigramme='LIQ')
+        try:
+            con_account = Account.objects.get(
+                cofprofile__user__first_name='Assurancetourix'
+            )
+        except Account.DoesNotExist:
+            con_account = random.choice(accounts)
+
+        for i in range(num_ops):
+
+            # Randomly pick account
+            if random.random() > 0.25:
+                account = random.choice(accounts)
+            else:
+                account = liq_account
+
+            # Randomly pick time
+            at = timezone.now() - timedelta(
+                seconds=random.randint(0, time))
+
+            # Majoration sur compte 'concert'
+            if random.random() < 0.2:
+                addcost = True
+                addcost_for = con_account
+                addcost_amount = Decimal('0.5')
+            else:
+                addcost = False
+
+            # Initialize opegroup amount
+            amount = Decimal('0')
+
+            opegroup = OperationGroup.objects.create(
+                on_acc=account,
+                checkout=checkout,
+                at=at,
+                is_cof=account.cofprofile.is_cof
+            )
+
+            # Generating operations
+            ope_list = []
+            for j in range(random.randint(1, 4)):
+                # Operation type
+                typevar = random.random()
+
+                # 0.1 probability to have a charge
+                if typevar > 0.9 and account != liq_account:
+                    ope = Operation(
+                        group=opegroup,
+                        type=Operation.DEPOSIT,
+                        is_checkout=(random.random() > 0.2),
+                        amount=Decimal(random.randint(1, 99)/10)
+                    )
+                # 0.1 probability to have a withdrawal
+                elif typevar > 0.8 and account != liq_account:
+                    ope = Operation(
+                        group=opegroup,
+                        type=Operation.WITHDRAW,
+                        is_checkout=(random.random() > 0.2),
+                        amount=-Decimal(random.randint(1, 99)/10)
+                    )
+                else:
+                    article = random.choice(articles)
+                    nb = random.randint(1, 5)
+
+                    ope = Operation(
+                        group=opegroup,
+                        type=Operation.PURCHASE,
+                        amount=-article.price*nb,
+                        article=article,
+                        article_nb=nb
+                    )
+
+                    purchases += 1
+
+                    if addcost:
+                        ope.addcost_for = addcost_for
+                        ope.addcost_amount = addcost_amount * nb
+                        ope.amount -= ope.addcost_amount
+
+                ope_list.append(ope)
+                amount += ope.amount
+
+            Operation.objects.bulk_create(ope_list)
+            opes_created += len(ope_list)
+            opegroup.amount = amount
+            opegroup.save()
+
+        # Transfer generation
+        for i in range(num_transfers):
+
+            # Randomly pick time
+            at = timezone.now() - timedelta(
+                seconds=random.randint(0, time))
+
+            # Choose whether to have a comment
+            if random.random() > 0.5:
+                comment = "placeholder comment"
+            else:
+                comment = ""
+
+            transfergroup = TransferGroup.objects.create(
+                at=at,
+                comment=comment,
+                valid_by=random.choice(accounts)
+            )
+
+            # Randomly generate transfer
+            transfer_list = []
+            for i in range(random.randint(1, 4)):
+                transfer_list.append(Transfer(
+                    group=transfergroup,
+                    from_acc=random.choice(accounts),
+                    to_acc=random.choice(accounts),
+                    amount=Decimal(random.randint(1, 99)/10)
+                ))
+
+            Transfer.objects.bulk_create(transfer_list)
+            transfers += len(transfer_list)
+
+        self.stdout.write(
+            "- {:d} opérations créées dont {:d} commandes d'articles"
+            .format(opes_created, purchases))
+
+        if transfers:
+            self.stdout.write("- {:d} transferts créés"
+                              .format(transfers))
diff --git a/kfet/management/commands/loadkfetdevdata.py b/kfet/management/commands/loadkfetdevdata.py
index 705f6f27..7f2ec9a3 100644
--- a/kfet/management/commands/loadkfetdevdata.py
+++ b/kfet/management/commands/loadkfetdevdata.py
@@ -5,15 +5,15 @@ Crée des utilisateurs, des articles et des opérations aléatoires
 import os
 import random
 from datetime import timedelta
-from decimal import Decimal
 
 from django.utils import timezone
 from django.contrib.auth.models import User, Group, Permission, ContentType
+from django.core.management import call_command
 
 from gestioncof.management.base import MyBaseCommand
 from gestioncof.models import CofProfile
-from kfet.models import (Account, Article, OperationGroup, Operation,
-                         Checkout, CheckoutStatement)
+from kfet.models import (Account, Checkout, CheckoutStatement, Supplier,
+                         SupplierArticle, Article)
 
 # Où sont stockés les fichiers json
 DATA_DIR = os.path.join(os.path.dirname(os.path.dirname(__file__)),
@@ -126,65 +126,24 @@ class Command(MyBaseCommand):
                 amount_error=0
             )
 
+        # ---
+        # Fournisseur
+        # ---
+
+        supplier, created = Supplier.objects.get_or_create(name="Panoramix")
+        if created:
+            articles = random.sample(list(Article.objects.all()), 40)
+            to_create = []
+            for article in articles:
+                to_create.append(SupplierArticle(
+                    supplier=supplier,
+                    article=article
+                ))
+
+            SupplierArticle.objects.bulk_create(to_create)
+
         # ---
         # Opérations
         # ---
 
-        self.stdout.write("Génération d'opérations")
-
-        articles = Article.objects.all()
-        accounts = Account.objects.exclude(trigramme='LIQ')
-
-        num_op = 100
-        # Operations are put uniformly over the span of a week
-        past_date = 3600*24*7
-
-        for i in range(num_op):
-            if random.random() > 0.25:
-                account = random.choice(accounts)
-            else:
-                account = liq_account
-
-            amount = Decimal('0')
-            at = timezone.now() - timedelta(
-                seconds=random.randint(0, past_date))
-
-            opegroup = OperationGroup(
-                on_acc=account,
-                checkout=checkout,
-                at=at,
-                is_cof=account.cofprofile.is_cof)
-
-            opegroup.save()
-
-            for j in range(random.randint(1, 4)):
-                typevar = random.random()
-                if typevar > 0.9 and account != liq_account:
-                    ope = Operation(
-                        group=opegroup,
-                        type=Operation.DEPOSIT,
-                        amount=Decimal(random.randint(1, 99)/10,)
-                    )
-                elif typevar > 0.8 and account != liq_account:
-                    ope = Operation(
-                        group=opegroup,
-                        type=Operation.WITHDRAW,
-                        amount=-Decimal(random.randint(1, 99)/10,)
-                    )
-                else:
-                    article = random.choice(articles)
-                    nb = random.randint(1, 5)
-
-                    ope = Operation(
-                        group=opegroup,
-                        type=Operation.PURCHASE,
-                        amount=-article.price*nb,
-                        article=article,
-                        article_nb=nb
-                    )
-
-                ope.save()
-                amount += ope.amount
-
-            opegroup.amount = amount
-            opegroup.save()
+        call_command('createopes', '100', '7', '--transfers=20')
diff --git a/kfet/migrations/0048_default_datetime.py b/kfet/migrations/0048_default_datetime.py
new file mode 100644
index 00000000..c9bacf1e
--- /dev/null
+++ b/kfet/migrations/0048_default_datetime.py
@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.utils.timezone
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('kfet', '0047_auto_20170104_1528'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='operationgroup',
+            name='at',
+            field=models.DateTimeField(default=django.utils.timezone.now),
+        ),
+        migrations.AlterField(
+            model_name='transfergroup',
+            name='at',
+            field=models.DateTimeField(default=django.utils.timezone.now),
+        ),
+    ]
diff --git a/kfet/models.py b/kfet/models.py
index 9d4a9536..9bb4f4f1 100644
--- a/kfet/models.py
+++ b/kfet/models.py
@@ -466,7 +466,7 @@ class OrderArticle(models.Model):
     quantity_received = models.IntegerField(default = 0)
 
 class TransferGroup(models.Model):
-    at = models.DateTimeField(auto_now_add = True)
+    at = models.DateTimeField(default=timezone.now)
     # Optional
     comment = models.CharField(
         max_length = 255,
@@ -502,7 +502,7 @@ class OperationGroup(models.Model):
     checkout = models.ForeignKey(
         Checkout, on_delete = models.PROTECT,
         related_name = "opesgroup")
-    at = models.DateTimeField(auto_now_add = True)
+    at = models.DateTimeField(default=timezone.now)
     amount = models.DecimalField(
         max_digits = 6, decimal_places = 2,
         default = 0)
diff --git a/kfet/static/kfet/js/kfet.js b/kfet/static/kfet/js/kfet.js
index 8236b3e9..cc369e32 100644
--- a/kfet/static/kfet/js/kfet.js
+++ b/kfet/static/kfet/js/kfet.js
@@ -27,6 +27,53 @@ $(document).ready(function() {
     }
 });
 
+/*
+ * Generic Websocket class and k-psul ws instanciation
+ */
+
+class KfetWebsocket {
+
+    static get defaults() {
+        return {"relative_url": "", "default_msg": {}, "handlers": []};
+    }
+
+    constructor(data) {
+        $.extend(this, this.constructor.defaults, data);
+    }
+    
+    get url() {
+        var websocket_protocol = window.location.protocol == 'https:' ? 'wss' : 'ws';
+        var location_host = window.location.host;
+        var location_url = window.location.pathname.startsWith('/gestion/') ? location_host + '/gestion' : location_host;
+
+        return websocket_protocol+"://" + location_url + this.relative_url ;
+    }
+
+    add_handler(handler) {
+        if (!this.socket)
+            this.listen();
+
+        this.handlers.push(handler);
+    }
+
+    listen() {
+        var that = this;
+        this.socket = new ReconnectingWebSocket(this.url);
+
+        this.socket.onmessage = function(e) {
+            var data = $.extend({}, that.default_msg, JSON.parse(e.data));
+            for (let handler of that.handlers) {
+                handler(data);
+            }
+        }
+    }
+}
+
+var OperationWebSocket = new KfetWebsocket({
+    'relative_url': '/ws/k-fet/k-psul/',
+    'default_msg': {'opegroups':[],'opes':[],'checkouts':[],'articles':[]},
+});
+
 function dateUTCToParis(date) {
     return moment.tz(date, 'UTC').tz('Europe/Paris');
 }
diff --git a/kfet/templates/kfet/kpsul.html b/kfet/templates/kfet/kpsul.html
index 5e5ce87d..1360a4be 100644
--- a/kfet/templates/kfet/kpsul.html
+++ b/kfet/templates/kfet/kpsul.html
@@ -12,7 +12,6 @@
 <script type="text/javascript" src="{% static 'kfet/js/moment.js' %}"></script>
 <script type="text/javascript" src="{% static 'kfet/js/moment-fr.js' %}"></script>
 <script type="text/javascript" src="{% static 'kfet/js/moment-timezone-with-data-2010-2020.js' %}"></script>
-<script type="text/javascript" src="{% static 'kfet/js/kfet.js' %}"></script>
 <script type="text/javascript" src="{% static 'kfet/js/history.js' %}"></script>
 {% endblock %}
 
@@ -1362,15 +1361,7 @@ $(document).ready(function() {
     // Synchronization
     // -----
 
-    websocket_msg_default = {'opegroups':[],'opes':[],'checkouts':[],'articles':[]}
-
-    var websocket_protocol = window.location.protocol == 'https:' ? 'wss' : 'ws';
-    var location_host = window.location.host;
-    var location_url = window.location.pathname.startsWith('/gestion/') ? location_host + '/gestion' : location_host;
-    socket = new ReconnectingWebSocket(websocket_protocol+"://" + location_url + "/ws/k-fet/k-psul/");
-    socket.onmessage = function(e) {
-        data = $.extend({}, websocket_msg_default, JSON.parse(e.data));
-
+    OperationWebSocket.add_handler(function(data) {
         for (var i=0; i<data['opegroups'].length; i++) {
             if (data['opegroups'][i]['add']) {
                 khistory.addOpeGroup(data['opegroups'][i]);
@@ -1401,7 +1392,7 @@ $(document).ready(function() {
             settings['addcost_amount'] = parseFloat(data['addcost']['amount']);
             displayAddcost();
         }
-    }
+    });
 
     // -----
     // General
diff --git a/kfet/views.py b/kfet/views.py
index 3c78601f..f2ea1599 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -1038,7 +1038,9 @@ def kpsul_perform_operations(request):
         operationgroup.comment = operationgroup.comment.strip()
         if not operationgroup.comment:
             data['errors']['need_comment'] = True
-            return JsonResponse(data, status=400)
+
+    if data['errors']:
+        return JsonResponse(data, status=400)
 
     if stop or not request.user.has_perms(required_perms):
         missing_perms = get_missing_perms(required_perms, request.user)