diff --git a/src/Entity/Attachments/Attachment.php b/src/Entity/Attachments/Attachment.php
index 7c07a465..bc3f52b8 100644
--- a/src/Entity/Attachments/Attachment.php
+++ b/src/Entity/Attachments/Attachment.php
@@ -71,8 +71,9 @@ abstract class Attachment extends AbstractNamedDBElement
 
     /**
      * @var string The class of the element that can be passed to this attachment. Must be overridden in subclasses.
+     *
      */
-    public const ALLOWED_ELEMENT_CLASS = '';
+    protected const ALLOWED_ELEMENT_CLASS = '';
 
     /**
      * @var string|null the original filename the file had, when the user uploaded it
@@ -463,4 +464,13 @@ abstract class Attachment extends AbstractNamedDBElement
 
         return (bool) filter_var($string, FILTER_VALIDATE_URL);
     }
+
+    /**
+     * Returns the class of the element that is allowed to be associated with this attachment.
+     * @return string
+     */
+    public function getElementClass(): string
+    {
+        return static::ALLOWED_ELEMENT_CLASS;
+    }
 }
diff --git a/src/Entity/Parameters/AbstractParameter.php b/src/Entity/Parameters/AbstractParameter.php
index b033c0ac..be918d00 100644
--- a/src/Entity/Parameters/AbstractParameter.php
+++ b/src/Entity/Parameters/AbstractParameter.php
@@ -64,7 +64,7 @@ abstract class AbstractParameter extends AbstractNamedDBElement
     /**
      * @var string The class of the element that can be passed to this attachment. Must be overridden in subclasses.
      */
-    public const ALLOWED_ELEMENT_CLASS = '';
+    protected const ALLOWED_ELEMENT_CLASS = '';
 
     /**
      * @var string The mathematical symbol for this specification. Can be rendered pretty later. Should be short
@@ -400,4 +400,13 @@ abstract class AbstractParameter extends AbstractNamedDBElement
 
         return $str;
     }
+
+    /**
+     * Returns the class of the element that is allowed to be associated with this attachment.
+     * @return string
+     */
+    public function getElementClass(): string
+    {
+        return static::ALLOWED_ELEMENT_CLASS;
+    }
 }