diff --git a/inventory/models.py b/inventory/models.py
index 765f5754..53dee7df 100644
--- a/inventory/models.py
+++ b/inventory/models.py
@@ -381,7 +381,17 @@ class CarEquipment(models.Model, LocalizedNameMixin):
 
     def save(self, *args, **kwargs):
         if not self.slug:
-            self.slug = slugify(self.name)
+            base_slug = slugify(self.name)
+            self.slug = base_slug
+            counter = 1
+
+            while (
+                self.__class__.objects.filter(slug=self.slug)
+                .exclude(pk=self.pk)
+                .exists()
+            ):
+                self.slug = f"{base_slug}-{counter}"
+                counter += 1
         super().save(*args, **kwargs)
 
     def __str__(self):
@@ -1232,6 +1242,9 @@ class Dealer(models.Model, LocalizedNameMixin):
             return None
 
     @property
+    def customers(self):
+        return models.Customer.objects.filter(dealer=self)
+    @property
     def user_quota(self):
         try:
             quota_dict = get_user_quota(self.user)
@@ -2294,7 +2307,7 @@ class Opportunity(models.Model):
             opportinity_for = self.organization.name
 
         if not self.slug:
-            base_slug = slugify(f"opportunity for {opportinity_for}")
+            base_slug = slugify(f"opportinity {opportinity_for}")
             self.slug = base_slug
             counter = 1
 
diff --git a/inventory/urls.py b/inventory/urls.py
index 2fae0256..cca5ab0a 100644
--- a/inventory/urls.py
+++ b/inventory/urls.py
@@ -46,7 +46,7 @@ urlpatterns = [
         name="manager_dashboard",
     ),
     path("dashboards/sales/", views.SalesDashboard.as_view(), name="sales_dashboard"),
-    path("test/", views.TestView.as_view(), name="test"),
+
     path("cars/inventory/table/", views.CarListViewTable.as_view(), name="car_table"),
     path("export/format/", TableExport.export, name="export"),
     # Dealer URLs
diff --git a/inventory/views.py b/inventory/views.py
index f4bd58c9..212dcad3 100644
--- a/inventory/views.py
+++ b/inventory/views.py
@@ -106,10 +106,10 @@ from django_ledger.forms.bank_account import (
     BankAccountUpdateForm,
 )
 from django_ledger.views.bill import (
-    # BillModelCreateView,
-    # BillModelDetailView,
-    # BillModelUpdateView,
-    # BaseBillActionView as BaseBillActionViewBase,
+    BillModelCreateView,
+    BillModelDetailView,
+    BillModelUpdateView,
+    BaseBillActionView as BaseBillActionViewBase,
     BillModelModelBaseView,
 )
 from django_ledger.forms.bill import (
@@ -277,11 +277,6 @@ def switch_language(request):
         logger.warning(f"Invalid language code: {language}")
         return redirect("/")
 
-
-def testview(request):
-    return HttpResponse("test")
-
-
 def dealer_signup(request):
     from django_q.tasks import async_task
     """
@@ -356,7 +351,6 @@ def dealer_signup(request):
         "account/signup-wizard.html",
     )
 
-
 class HomeView(LoginRequiredMixin, TemplateView):
     """
     HomeView class responsible for rendering the home page.
@@ -393,6 +387,7 @@ class TestView(TemplateView):
     template_name = "inventory/cars_list_api.html"
 
 
+
 class ManagerDashboard(LoginRequiredMixin, TemplateView):
     """
     ManagerDashboard class is a view handling the dashboard for a manager.
@@ -513,7 +508,7 @@ class SalesDashboard(LoginRequiredMixin, TemplateView):
     def get_context_data(self, **kwargs):
         context = super().get_context_data(**kwargs)
         dealer = self.request.dealer
-        staff = self.request.staff
+        staff = getattr(self.request, "staff", None)
         total_cars = models.Car.objects.filter(dealer=dealer).count()
         total_reservations = models.CarReservation.objects.filter(
             reserved_by=self.request.user, reserved_until__gte=timezone.now()
@@ -715,6 +710,17 @@ class AjaxHandlerView(LoginRequiredMixin, View):
         if result := decodevin(vin_no):
             manufacturer_name, model_name, year_model = result.values()
             car_make = get_make(manufacturer_name)
+            if not car_make:
+                logger.info(
+                    f"VIN decoded using {decoding_method}: Make={manufacturer_name}, Model={model_name}, Year={year_model}"
+                )
+                return JsonResponse(
+                    {
+                        "success": False,
+                        "error": _("Manufacturer not found in the database"),
+                    },
+                    status=404,
+                )
             car_model = get_model(model_name, car_make)
 
             logger.info(