diff --git a/src/genlab_bestilling/models.py b/src/genlab_bestilling/models.py
index 6d1c7fb..2c953c0 100644
--- a/src/genlab_bestilling/models.py
+++ b/src/genlab_bestilling/models.py
@@ -96,6 +96,9 @@ def get_absolute_url(self):
 
 
 class Order(PolymorphicModel):
+    class CannotConfirm(Exception):
+        pass
+
     class OrderStatus(models.TextChoices):
         DRAFT = "draft", _("Draft")
         CONFIRMED = "confirmed", _("Confirmed")
@@ -113,6 +116,10 @@ class OrderStatus(models.TextChoices):
 
     tags = TaggableManager(blank=True)
 
+    def confirm_order(self):
+        self.status = Order.OrderStatus.CONFIRMED
+        self.save()
+
 
 class EquipmentType(models.Model):
     name = models.CharField(max_length=255, null=True, blank=True)
@@ -141,6 +148,11 @@ def get_absolute_url(self):
             kwargs={"pk": self.pk, "project_id": self.project_id},
         )
 
+    def confirm_order(self):
+        if not EquimentOrderQuantity.objects.filter(order=self).exists():
+            raise Order.CannotConfirm(_("No equipments found"))
+        return super().confirm_order()
+
 
 class AnalysisOrder(Order):
     has_guid = models.BooleanField()  # TODO: default?
@@ -154,6 +166,11 @@ def get_absolute_url(self):
             kwargs={"pk": self.pk, "project_id": self.project_id},
         )
 
+    def confirm_order(self):
+        if not self.samples.all().exists():
+            raise Order.CannotConfirm(_("No samples found"))
+        return super().confirm_order()
+
 
 class Sample(models.Model):
     order = models.ForeignKey(
diff --git a/src/genlab_bestilling/views.py b/src/genlab_bestilling/views.py
index 5a425e9..231aaf1 100644
--- a/src/genlab_bestilling/views.py
+++ b/src/genlab_bestilling/views.py
@@ -1,10 +1,12 @@
 from typing import Any
 
+from django.contrib import messages
 from django.contrib.auth.mixins import LoginRequiredMixin
 from django.db.models.base import Model as Model
 from django.db.models.query import QuerySet
 from django.http import HttpResponse
 from django.urls import reverse
+from django.utils.translation import gettext as _
 from django.views.generic import CreateView, DetailView, FormView, UpdateView
 from django.views.generic.detail import SingleObjectMixin
 from django_tables2.views import SingleTableView
@@ -164,9 +166,16 @@ def post(self, request, *args, **kwargs):
         return super().post(request, *args, **kwargs)
 
     def form_valid(self, form: Any) -> HttpResponse:
-        # TODO: check state transition
-        self.object.status = Order.OrderStatus.CONFIRMED
-        self.object.save()
+        i = self.object.get_real_instance()
+        try:
+            # TODO: check state transition
+            i.confirm_order()
+            messages.add_message(
+                self.request, messages.SUCCESS, _("Your order is confirmed")
+            )
+        except Order.CannotConfirm as e:
+            messages.add_message(self.request, messages.ERROR, str(e))
+
         return super().form_valid(form)
 
     def get_success_url(self) -> str:
diff --git a/src/theme/static_src/src/styles.css b/src/theme/static_src/src/styles.css
index 5fad4c5..32c707f 100644
--- a/src/theme/static_src/src/styles.css
+++ b/src/theme/static_src/src/styles.css
@@ -16,7 +16,7 @@
         @apply border-blue-500 bg-blue-300;
     }
 
-    .alert.alert-danger {
+    .alert.alert-error {
         @apply border-red-500 bg-red-300;
     }