diff --git a/kfet/forms.py b/kfet/forms.py
index 2c01c3c2..50873987 100644
--- a/kfet/forms.py
+++ b/kfet/forms.py
@@ -163,9 +163,11 @@ class KPsulOperationForm(forms.ModelForm):
                 raise ValidationError("Charge non positive")
             if type_ope == Operation.WITHDRAW and amount >= 0:
                 raise ValidationError("Retrait non négatif")
+            self.cleaned_data['article']    = None
+            self.cleaned_data['article_nb'] = None
 
 KPsulOperationFormSet = modelformset_factory(
-        Operation,
-        form    = KPsulOperationForm,
-        extra   = 1,
-        min_num = 1, validate_min = True)
+    Operation,
+    form    = KPsulOperationForm,
+    extra   = 1,
+    min_num = 1, validate_min = True)
diff --git a/kfet/migrations/0014_auto_20160807_2314.py b/kfet/migrations/0014_auto_20160807_2314.py
new file mode 100644
index 00000000..50417091
--- /dev/null
+++ b/kfet/migrations/0014_auto_20160807_2314.py
@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('kfet', '0013_auto_20160807_1840'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='globalpermissions',
+            options={'permissions': (('is_team', 'Is part of the team'), ('can_perform_deposit', 'Peut effectuer une charge')), 'managed': False},
+        ),
+    ]
diff --git a/kfet/migrations/0015_auto_20160807_2324.py b/kfet/migrations/0015_auto_20160807_2324.py
new file mode 100644
index 00000000..a1789fc2
--- /dev/null
+++ b/kfet/migrations/0015_auto_20160807_2324.py
@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('kfet', '0014_auto_20160807_2314'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='globalpermissions',
+            options={'permissions': (('is_team', 'Is part of the team'), ('can_perform_deposit', 'Peut effectuer une charge'), ('can_perform_negative_operations', 'Peut enregistrer des commandes en négatif')), 'managed': False},
+        ),
+    ]
diff --git a/kfet/models.py b/kfet/models.py
index 31eac33e..5db871be 100644
--- a/kfet/models.py
+++ b/kfet/models.py
@@ -93,6 +93,13 @@ class Account(models.Model):
             data['is_free'] = True
         return data
 
+    def perms_to_perform_operation(self, amount):
+        new_balance = self.balance + amount
+        perms = []
+        if new_balance < 0:
+            perms.append('kfet.can_perform_negative_operations')
+        return perms
+
     # Surcharge Méthode save() avec gestions de User et CofProfile
     # Args:
     # - data : datas pour User et CofProfile
@@ -415,6 +422,9 @@ class GlobalPermissions(models.Model):
         managed = False
         permissions = (
             ('is_team', 'Is part of the team'),
+            ('can_perform_deposit', 'Peut effectuer une charge'),
+            ('can_perform_negative_operations',
+                'Peut enregistrer des commandes en négatif')
         )
 
 class Settings(models.Model):
@@ -437,4 +447,5 @@ class Settings(models.Model):
             return 0
 
     class SettingsError(Exception):
-        pass
+        def __init__(self, msg):
+            self.msg = msg
diff --git a/kfet/views.py b/kfet/views.py
index c8ca4836..b9384231 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -6,7 +6,7 @@ from django.core.urlresolvers import reverse_lazy
 from django.contrib import messages
 from django.contrib.messages.views import SuccessMessageMixin
 from django.contrib.auth.decorators import login_required, permission_required
-from django.contrib.auth.models import User
+from django.contrib.auth.models import User, Permission
 from django.http import HttpResponse, JsonResponse, Http404
 from django.forms import modelformset_factory
 from gestioncof.models import CofProfile, Clipper
@@ -398,7 +398,7 @@ def kpsul_perform_operations(request):
     if not operation_formset.is_valid():
         data['errors'].append({'operations': list(operation_formset.errors) })
 
-    # Returning bad request if errors
+    # Returning BAD REQUEST if errors
     if 'errors' in data:
         return JsonResponse(data, status=400)
 
@@ -410,14 +410,43 @@ def kpsul_perform_operations(request):
     cof_grant = Settings.SUBVENTION_COF()
     cof_grant_divisor = 1 + cof_grant / 100
 
-    # Calculating amount of each PURCHASE operations
-    # and total amount for operation group
+    # Initializing required perms
+    required_perms = []
+
+    # 1. Calculating amount of each PURCHASE operations
+    # 2. and total amount for operation group
+    # 3. Adding required permissions to perform each operation
     for operation in operations:
+        # 1
         if operation.type == Operation.PURCHASE:
             operation.amount = - operation.article.price * operation.article_nb
             if operationgroup.on_acc.is_cof:
                 operation.amount = operation.amount / cof_grant_divisor
+        # 2
         operationgroup.amount += operation.amount
+        # 3
+        if operation.type == Operation.DEPOSIT:
+            required_perms.append('kfet.can_perform_deposit')
+
+
+    # Adding required permissions to perform operation group
+    opegroup_perms = operationgroup.on_acc.perms_to_perform_operation(
+        amount = operationgroup.amount)
+    required_perms += opegroup_perms
+
+    # Checking authenticated user has all perms
+    if not request.user.has_perms(required_perms):
+        # Sending BAD_REQUEST with missing perms
+        missing_perms = \
+            [ Permission.objects.get(codename=codename).name for codename in (
+                (perm.split('.'))[1] for perm in
+                required_perms if not request.user.has_perm(perm)
+            )]
+        data['errors'].append({'missing_perms': missing_perms })
+        return JsonResponse(data, status=400)
+
+    # If 1 perm is required, saving who perform the operations
+    operationgroup.valid_by = request.user.profile.account_kfet
 
     # Filling cof status for statistics
     operationgroup.is_cof = operationgroup.on_acc.is_cof