diff --git a/kfet/forms.py b/kfet/forms.py
index 54c0dd38..0c563b04 100644
--- a/kfet/forms.py
+++ b/kfet/forms.py
@@ -280,12 +280,12 @@ class KPsulOperationGroupForm(forms.ModelForm):
             is_protected=False, valid_from__lte=timezone.now(),
             valid_to__gte=timezone.now()),
         widget   = forms.HiddenInput())
+    on_acc = forms.ModelChoiceField(
+        queryset = Account.objects.exclude(trigramme='GNR'),
+        widget = forms.HiddenInput())
     class Meta:
         model  = OperationGroup
         fields = ['on_acc', 'checkout', 'comment']
-        widgets = {
-            'on_acc'  : forms.HiddenInput(),
-        }
 
 class KPsulAccountForm(forms.ModelForm):
     class Meta:
@@ -418,11 +418,11 @@ class TransferGroupForm(forms.ModelForm):
 
 class TransferForm(forms.ModelForm):
     from_acc = forms.ModelChoiceField(
-        queryset = Account.objects.exclude(trigramme__in=['LIQ', '#13']),
+        queryset = Account.objects.exclude(trigramme__in=['LIQ', '#13', 'GNR']),
         widget   = forms.HiddenInput()
     )
     to_acc = forms.ModelChoiceField(
-        queryset = Account.objects.exclude(trigramme__in=['LIQ', '#13']),
+        queryset = Account.objects.exclude(trigramme__in=['LIQ', '#13', 'GNR']),
         widget   = forms.HiddenInput()
     )