diff --git a/registrasion/forms.py b/registrasion/forms.py
index 54b3115a..5027e068 100644
--- a/registrasion/forms.py
+++ b/registrasion/forms.py
@@ -1,5 +1,7 @@
 import models as rego
 
+from controllers.product import ProductController
+
 from django import forms
 
 
@@ -34,6 +36,14 @@ def CategoryForm(category):
             ''' Removes a given product from this form. '''
             del self.fields[field_name(product)]
 
+        def disable_products_for_user(self, user):
+            for product in products:
+                # Remove fields that do not have an enabling condition.
+                prod = ProductController(product)
+                if not prod.can_add_with_enabling_conditions(user, 0):
+                    self.disable_product(product)
+
+
     products = rego.Product.objects.filter(category=category).order_by("order")
     for product in products:
 
diff --git a/registrasion/views.py b/registrasion/views.py
index 3957da7d..f7d0f9c5 100644
--- a/registrasion/views.py
+++ b/registrasion/views.py
@@ -30,6 +30,7 @@ def product_category(request, category_id):
 
     if request.method == "POST":
         cat_form = CategoryForm(request.POST, request.FILES, prefix=PRODUCTS_FORM_PREFIX)
+        cat_form.disable_products_for_user(request.user)
         voucher_form = forms.VoucherForm(request.POST, prefix=VOUCHERS_FORM_PREFIX)
 
         if voucher_form.is_valid():
@@ -75,15 +76,10 @@ def product_category(request, category_id):
 
         initial = CategoryForm.initial_data(quantities)
         cat_form = CategoryForm(prefix=PRODUCTS_FORM_PREFIX, initial=initial)
+        cat_form.disable_products_for_user(request.user)
 
         voucher_form = forms.VoucherForm(prefix=VOUCHERS_FORM_PREFIX)
 
-    for product in products:
-        # Remove fields that do not have an enabling condition.
-        prod = ProductController(product)
-        if not prod.can_add_with_enabling_conditions(request.user, 0):
-            cat_form.disable_product(product)
-
 
     data = {
         "category": category,