diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5f74964..4c34f7e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+* Make the required single platform destination explicit when creating an installation
+
 ### Added
 
 * Optional tenant group and tenant assignments for software licenses
diff --git a/README.md b/README.md
index f5a672f..26b7157 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,7 @@ Die installierte Version kann anschließend geprüft werden:
 /opt/netbox/venv/bin/pip show netbox-slm
 ```
 
-Für diese Variante muss dort mindestens Version `1.11.0` stehen.
+Für diese Variante muss dort mindestens Version `1.11.1` stehen.
 
 ### 3. Plugin in NetBox aktivieren
 
diff --git a/netbox_slm/__init__.py b/netbox_slm/__init__.py
index 6a5dcc2..dae1884 100644
--- a/netbox_slm/__init__.py
+++ b/netbox_slm/__init__.py
@@ -17,7 +17,7 @@ limitations under the License.
 from netbox.plugins import PluginConfig
 from django.utils.translation import gettext_lazy as _
 
-__version__ = "1.11.0"
+__version__ = "1.11.1"
 
 
 class SLMConfig(PluginConfig):
diff --git a/netbox_slm/forms/software_product_installation.py b/netbox_slm/forms/software_product_installation.py
index 9bdcb52..ebed762 100644
--- a/netbox_slm/forms/software_product_installation.py
+++ b/netbox_slm/forms/software_product_installation.py
@@ -18,14 +18,28 @@ from virtualization.models import Cluster, VirtualMachine
 
 class SoftwareProductInstallationForm(NetBoxModelForm):
     comments = CommentField()
+    fieldsets = (
+        FieldSet("device", "virtualmachine", "cluster", name=_("Platform Destination (select exactly one)")),
+        FieldSet("software_product", "version", name=_("Software")),
+        FieldSet("tags", name=_("Tags")),
+    )
 
-    device = DynamicModelChoiceField(queryset=Device.objects.all(), required=False)
+    device = DynamicModelChoiceField(
+        queryset=Device.objects.all(),
+        required=False,
+        help_text=_("Select either a device, a virtual machine, or a cluster."),
+    )
     virtualmachine = DynamicModelChoiceField(
         queryset=VirtualMachine.objects.all(),
         required=False,
         label=_("Virtual Machine"),
+        help_text=_("Leave empty when another platform destination is selected."),
+    )
+    cluster = DynamicModelChoiceField(
+        queryset=Cluster.objects.all(),
+        required=False,
+        help_text=_("Leave empty when another platform destination is selected."),
     )
-    cluster = DynamicModelChoiceField(queryset=Cluster.objects.all(), required=False)
     software_product = DynamicModelChoiceField(
         queryset=SoftwareProduct.objects.all(),
         required=True,
@@ -60,6 +74,17 @@ class SoftwareProductInstallationForm(NetBoxModelForm):
             )
         return version
 
+    def clean(self):
+        cleaned_data = super().clean()
+        destinations = [
+            cleaned_data.get("device"),
+            cleaned_data.get("virtualmachine"),
+            cleaned_data.get("cluster"),
+        ]
+        if sum(destination is not None for destination in destinations) != 1:
+            raise ValidationError(_("Select exactly one platform destination: device, virtual machine, or cluster."))
+        return cleaned_data
+
 
 class SoftwareProductInstallationFilterForm(NetBoxModelFilterSetForm):
     model = SoftwareProductInstallation
diff --git a/netbox_slm/locale/de/LC_MESSAGES/django.mo b/netbox_slm/locale/de/LC_MESSAGES/django.mo
index 8dc7426..6e8442e 100644
Binary files a/netbox_slm/locale/de/LC_MESSAGES/django.mo and b/netbox_slm/locale/de/LC_MESSAGES/django.mo differ
diff --git a/netbox_slm/locale/de/LC_MESSAGES/django.po b/netbox_slm/locale/de/LC_MESSAGES/django.po
index 3382503..4662037 100644
--- a/netbox_slm/locale/de/LC_MESSAGES/django.po
+++ b/netbox_slm/locale/de/LC_MESSAGES/django.po
@@ -321,3 +321,18 @@ msgstr "Erneuerungsintervall und Einheit müssen gemeinsam angegeben werden."
 
 msgid "A lifetime license cannot have a renewal interval or expiration date."
 msgstr "Eine Lifetime-Lizenz darf kein Erneuerungsintervall und kein Ablaufdatum haben."
+
+msgid "Platform Destination (select exactly one)"
+msgstr "Plattformziel (genau eines auswählen)"
+
+msgid "Software"
+msgstr "Software"
+
+msgid "Select either a device, a virtual machine, or a cluster."
+msgstr "Wähle entweder ein Gerät, eine virtuelle Maschine oder einen Cluster aus."
+
+msgid "Leave empty when another platform destination is selected."
+msgstr "Leer lassen, wenn ein anderes Plattformziel ausgewählt wurde."
+
+msgid "Select exactly one platform destination: device, virtual machine, or cluster."
+msgstr "Wähle genau ein Plattformziel aus: Gerät, virtuelle Maschine oder Cluster."
diff --git a/netbox_slm/models.py b/netbox_slm/models.py
index 4dbd851..fce3596 100644
--- a/netbox_slm/models.py
+++ b/netbox_slm/models.py
@@ -146,7 +146,9 @@ class SoftwareProductInstallation(NetBoxModel):
                     | models.Q(device__isnull=True, virtualmachine__isnull=False, cluster__isnull=True)
                     | models.Q(device__isnull=True, virtualmachine__isnull=True, cluster__isnull=False)
                 ),
-                violation_error_message=_("Installation requires exactly one platform destination."),
+                violation_error_message=_(
+                    "Select exactly one platform destination: device, virtual machine, or cluster."
+                ),
             )
         ]
 
diff --git a/netbox_slm/tests/test_models.py b/netbox_slm/tests/test_models.py
index 8b550c8..31d816c 100644
--- a/netbox_slm/tests/test_models.py
+++ b/netbox_slm/tests/test_models.py
@@ -1,6 +1,6 @@
 from django.core.exceptions import ValidationError
 from django.utils.translation import gettext, override
-from netbox_slm.forms import SoftwareLicenseForm
+from netbox_slm.forms import SoftwareLicenseForm, SoftwareProductInstallationForm
 from netbox_slm.models import RenewalIntervalUnits, SoftwareLicense
 from tenancy.models import Tenant, TenantGroup
 
@@ -56,6 +56,25 @@ class ModelTestCase(SlmBaseTestCase):
         self.assertEqual("cluster", self.software_product_installation.render_type())
         self.assertEqual(self.cluster, self.software_product_installation.platform)
 
+    def test_installation_form_requires_exactly_one_platform_destination(self):
+        base_data = {
+            "software_product": self.software_product.pk,
+            "version": self.software_product_version.pk,
+        }
+
+        no_destination_form = SoftwareProductInstallationForm(data=base_data)
+        self.assertFalse(no_destination_form.is_valid())
+        self.assertIn("Select exactly one platform destination", str(no_destination_form.non_field_errors()))
+
+        one_destination_form = SoftwareProductInstallationForm(data={**base_data, "device": self.device.pk})
+        self.assertTrue(one_destination_form.is_valid(), one_destination_form.errors)
+
+        multiple_destinations_form = SoftwareProductInstallationForm(
+            data={**base_data, "device": self.device.pk, "cluster": self.cluster.pk}
+        )
+        self.assertFalse(multiple_destinations_form.is_valid())
+        self.assertIn("Select exactly one platform destination", str(multiple_destinations_form.non_field_errors()))
+
     def test_software_license_stored_location_txt(self):
         self.assertEqual("Link", self.software_license.stored_location_txt)