diff --git a/src/Twig/AssemblyTwigExtension.php b/src/Twig/AssemblyTwigExtension.php
new file mode 100644
index 00000000..3430f7d1
--- /dev/null
+++ b/src/Twig/AssemblyTwigExtension.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Twig;
+
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFunction;
+
+class AssemblyTwigExtension extends AbstractExtension
+{
+    public function getFunctions(): array
+    {
+        return [
+            new TwigFunction('has_assembly', [$this, 'hasAssembly']),
+        ];
+    }
+
+    public function hasAssembly(array $bomEntries): bool
+    {
+        foreach ($bomEntries as $entry) {
+            if ($entry->getAssembly() !== null) {
+                return true;
+            }
+        }
+        return false;
+    }
+}
\ No newline at end of file
diff --git a/templates/form/collection_types_layout.html.twig b/templates/form/collection_types_layout.html.twig
index 0175aeaf..552fd542 100644
--- a/templates/form/collection_types_layout.html.twig
+++ b/templates/form/collection_types_layout.html.twig
@@ -44,9 +44,18 @@
         <td style="min-width: 300px;">
             {{ form_row(form.part) }}
             {{ form_errors(form.part) }}
-            <div class="text-center mb-2" style="line-height: 1">∨</div>
-            {{ form_widget(form.assembly) }}
-            {{ form_errors(form.assembly) }}
+
+            {% if form.vars.value is not null and form.vars.value.project is not null %}
+                {% set hasAssembly = false %}
+                {% if is_granted("@assemblies.read") or has_assembly(form.vars.value.project.bomEntries.toArray) %}
+                    <div class="text-center mb-2" style="line-height: 1">∨</div>
+                    {{ form_widget(form.assembly) }}
+                    {{ form_errors(form.assembly) }}
+                {% endif %}
+            {% elseif is_granted("@assemblies.read") %}
+                {{ form_widget(form.assembly) }}
+                {{ form_errors(form.assembly) }}
+            {% endif %}
         </td>
         <td>
             {{ form_widget(form.name) }}