diff --git a/kfet/forms.py b/kfet/forms.py
index 17add53b..2127e05b 100644
--- a/kfet/forms.py
+++ b/kfet/forms.py
@@ -4,6 +4,7 @@ from django.contrib.auth.models import User, Group, Permission
 from django.contrib.contenttypes.models import ContentType
 from django.contrib.admin.widgets import FilteredSelectMultiple
 from django.forms import modelformset_factory
+from django.utils import timezone
 from kfet.models import (Account, Checkout, Article, OperationGroup, Operation,
     CheckoutStatement, ArticleCategory)
 from gestioncof.models import CofProfile
@@ -161,7 +162,9 @@ class ArticleRestrictForm(ArticleForm):
 
 class KPsulOperationGroupForm(forms.ModelForm):
     checkout = forms.ModelChoiceField(
-        queryset = Checkout.objects.filter(is_protected=False),
+        queryset = Checkout.objects.filter(
+            is_protected=False, valid_from__lte=timezone.now(),
+            valid_to__gte=timezone.now()),
         widget   = forms.HiddenInput())
     class Meta:
         model  = OperationGroup
@@ -184,7 +187,9 @@ class KPsulAccountForm(forms.ModelForm):
 
 class KPsulCheckoutForm(forms.Form):
     checkout = forms.ModelChoiceField(
-            queryset=Checkout.objects.filter(is_protected=False),
+            queryset=Checkout.objects.filter(
+            is_protected=False, valid_from__lte=timezone.now(),
+            valid_to__gte=timezone.now()),
             widget=forms.Select(attrs={'id':'id_checkout_select'}))
 
 class KPsulOperationForm(forms.ModelForm):
diff --git a/kfet/templates/kfet/checkout.html b/kfet/templates/kfet/checkout.html
index 43d19950..55db6136 100644
--- a/kfet/templates/kfet/checkout.html
+++ b/kfet/templates/kfet/checkout.html
@@ -12,7 +12,7 @@
         <div class="line">{{ checkouts|length }} caisses</div>
       </div>
       <div class="buttons">
-        <a class="btn btn-primary btn-lg" href="{% url 'kfet.checkout.create' %}">Créer un compte</a>
+        <a class="btn btn-primary btn-lg" href="{% url 'kfet.checkout.create' %}">Créer une caisse</a>
       </div>
     </div>
   </div>
diff --git a/kfet/templates/kfet/checkout_create.html b/kfet/templates/kfet/checkout_create.html
index 0e283825..0f254f65 100644
--- a/kfet/templates/kfet/checkout_create.html
+++ b/kfet/templates/kfet/checkout_create.html
@@ -6,8 +6,10 @@
 
 {% block content %}
 
+{% include 'kfet/base_messages.html' %}
 <form action="" method="post">
     {% csrf_token %}
+    {{ form.non_field_errors}}
     {% for field in form %}
         {{ field.errors }}
         {{ field.label_tag }}
diff --git a/kfet/templates/kfet/checkout_update.html b/kfet/templates/kfet/checkout_update.html
index 2b3d9183..0a4be1ac 100644
--- a/kfet/templates/kfet/checkout_update.html
+++ b/kfet/templates/kfet/checkout_update.html
@@ -13,11 +13,12 @@
     </div>
   </div>
   <div class="col-sm-8 col-md-9 col-content-right">
-    {% include "kfet/base_messages.html" %}
+    {% include 'kfet/base_messages.html' %}
     <div class="content-right">
       <div class="content-right-block">
         <form action="" method="post">
           {% csrf_token %}
+          {{ form.non_field_errors }}
           {% for field in form %}
             {{ field.errors }}
             {{ field.label_tag }}
diff --git a/kfet/views.py b/kfet/views.py
index 3a0f6b1d..f6f88ebb 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -337,7 +337,8 @@ class CheckoutCreate(SuccessMessageMixin, CreateView):
     def form_valid(self, form):
         # Checking permission
         if not self.request.user.has_perm('kfet.add_checkout'):
-            raise PermissionDenied
+            form.add_error(None, 'Permission refusée')
+            return self.form_invalid(form)
         # Creating
         form.instance.created_by = self.request.user.profile.account_kfet
         return super(CheckoutCreate, self).form_valid(form)
@@ -361,7 +362,8 @@ class CheckoutUpdate(SuccessMessageMixin, UpdateView):
     def form_valid(self, form):
         # Checking permission
         if not self.request.user.has_perm('kfet.change_checkout'):
-            raise PermissionDenied
+            form.add_error(None, 'Permission refusée')
+            return self.form_invalid(form)
         # Updating
         return super(CheckoutUpdate, self).form_valid(form)