diff --git a/src/DataTables/Column/EntityColumn.php b/src/DataTables/Column/EntityColumn.php
index 00f095f8..ccab11f6 100644
--- a/src/DataTables/Column/EntityColumn.php
+++ b/src/DataTables/Column/EntityColumn.php
@@ -32,6 +32,7 @@
 namespace App\DataTables\Column;
 
 
+use App\Entity\Base\DBElement;
 use App\Entity\Base\NamedDBElement;
 use App\Entity\Parts\Part;
 use App\Services\EntityURLGenerator;
@@ -76,14 +77,19 @@ class EntityColumn extends AbstractColumn
 
         $resolver->setDefault('render', function (Options $options) {
             return function ($value, Part $context) use ($options) {
+                /** @var DBElement $entity */
                 $entity = $this->accessor->getValue($context, $options['property']);
 
                 if ($entity) {
-                    return sprintf(
-                        '<a href="%s">%s</a>',
-                        $this->urlGenerator->listPartsURL($entity),
-                        $value
-                    );
+                    if ($entity->getID() !== null) {
+                        return sprintf(
+                            '<a href="%s">%s</a>',
+                            $this->urlGenerator->listPartsURL($entity),
+                            $value
+                        );
+                    } else {
+                        return sprintf('<i>%s</i>', $value);
+                    }
                 }
             };
         });
diff --git a/src/Entity/Parts/Part.php b/src/Entity/Parts/Part.php
index 2c2bc58d..48a74693 100644
--- a/src/Entity/Parts/Part.php
+++ b/src/Entity/Parts/Part.php
@@ -74,7 +74,10 @@ use Doctrine\ORM\Mapping as ORM;
 use Symfony\Component\Validator\Constraints as Assert;
 
 /**
- * Class Part.
+ * Part class.
+ *
+ * DONT USE orphanRemoval on properties with ColumnSecurity!! An empty collection will be created as placeholder,
+ * and the partlots are deleted, even if we want dont want that!
  *
  * @ORM\Entity(repositoryClass="App\Repository\PartRepository")
  * @ORM\Table("`parts`")
@@ -84,7 +87,8 @@ class Part extends AttachmentContainingDBElement
     public const INSTOCK_UNKNOWN = -2;
 
     /**
-     * @ORM\OneToMany(targetEntity="App\Entity\Attachments\PartAttachment", mappedBy="element", cascade={"persist", "remove"}, orphanRemoval=true)
+     * @ORM\OneToMany(targetEntity="App\Entity\Attachments\PartAttachment", mappedBy="element", cascade={"persist", "remove"}, orphanRemoval=false)
+     * @ColumnSecurity(type="collection", prefix="attachments")
      * @Assert\Valid()
      */
     protected $attachments;
@@ -93,6 +97,7 @@ class Part extends AttachmentContainingDBElement
      * @var Category
      * @ORM\ManyToOne(targetEntity="Category", inversedBy="parts")
      * @ORM\JoinColumn(name="id_category", referencedColumnName="id", nullable=false)
+     * @ColumnSecurity(prefix="category", type="App\Entity\Parts\Category")
      * @Selectable()
      */
     protected $category;
@@ -101,8 +106,7 @@ class Part extends AttachmentContainingDBElement
      * @var Footprint|null
      * @ORM\ManyToOne(targetEntity="Footprint", inversedBy="parts")
      * @ORM\JoinColumn(name="id_footprint", referencedColumnName="id")
-     *
-     * @ColumnSecurity(prefix="footprint", type="object")
+     * @ColumnSecurity(prefix="footprint", type="App\Entity\Parts\Footprint")
      * @Selectable()
      */
     protected $footprint;
@@ -111,8 +115,7 @@ class Part extends AttachmentContainingDBElement
      * @var Manufacturer|null
      * @ORM\ManyToOne(targetEntity="Manufacturer", inversedBy="parts")
      * @ORM\JoinColumn(name="id_manufacturer", referencedColumnName="id")
-     *
-     * @ColumnSecurity(prefix="manufacturer", type="object")
+     * @ColumnSecurity(prefix="manufacturer", type="App\Entity\Parts\Manufacturer")
      * @Selectable()
      */
     protected $manufacturer;
@@ -128,7 +131,7 @@ class Part extends AttachmentContainingDBElement
 
     /**
      * @var Orderdetail[]
-     * @ORM\OneToMany(targetEntity="App\Entity\PriceInformations\Orderdetail", mappedBy="part", cascade={"persist", "remove"}, orphanRemoval=true)
+     * @ORM\OneToMany(targetEntity="App\Entity\PriceInformations\Orderdetail", mappedBy="part", cascade={"persist", "remove"}, orphanRemoval=false)
      * @Assert\Valid()
      * @ColumnSecurity(prefix="orderdetails", type="collection")
      */
@@ -174,15 +177,15 @@ class Part extends AttachmentContainingDBElement
     /**
      * @var string
      * @ORM\Column(type="text")
-     *
      * @ColumnSecurity(prefix="description")
      */
     protected $description = '';
 
     /**
      * @var ?PartLot[]
-     * @ORM\OneToMany(targetEntity="PartLot", mappedBy="part", cascade={"persist", "remove"}, orphanRemoval=true)
+     * @ORM\OneToMany(targetEntity="PartLot", mappedBy="part", cascade={"persist", "remove"}, orphanRemoval=false)
      * @Assert\Valid()
+     * @ColumnSecurity(type="collection", prefix="lots")
      */
     protected $partLots;
 
@@ -233,14 +236,14 @@ class Part extends AttachmentContainingDBElement
      * @var string
      * @ORM\Column(type="string")
      * @Assert\Url()
-     * @ColumnSecurity(prefix="manufacturer", type="string", placeholder="")
+     * @ColumnSecurity(prefix="mpn", type="string", placeholder="")
      */
     protected $manufacturer_product_url = '';
 
     /**
      * @var string
      * @ORM\Column(type="string")
-     * @ColumnSecurity(prefix="manufacturer", type="string", placeholder="")
+     * @ColumnSecurity(prefix="mpn", type="string", placeholder="")
      */
     protected $manufacturer_product_number = '';
 
@@ -248,12 +251,14 @@ class Part extends AttachmentContainingDBElement
      * @var string
      * @ORM\Column(type="string", length=255, nullable=true)
      * @Assert\Choice({"announced", "active", "nrfnd", "eol", "discontinued", ""})
+     * @ColumnSecurity(type="string", prefix="status", placeholder="")
      */
     protected $manufacturing_status = "";
 
     /**
      * @var bool Determines if this part entry needs review (for example, because it is work in progress)
      * @ORM\Column(type="boolean")
+     * @ColumnSecurity(type="boolean")
      */
     protected $needs_review = false;
 
@@ -261,18 +266,21 @@ class Part extends AttachmentContainingDBElement
      * @var ?MeasurementUnit The unit in which the part's amount is measured.
      * @ORM\ManyToOne(targetEntity="MeasurementUnit", inversedBy="parts")
      * @ORM\JoinColumn(name="id_part_unit", referencedColumnName="id", nullable=true)
+     * @ColumnSecurity(type="object", prefix="unit")
      */
     protected $partUnit;
 
     /**
      * @var string A comma seperated list of tags, assocciated with the part.
      * @ORM\Column(type="text")
+     * @ColumnSecurity(type="string", prefix="tags", placeholder="")
      */
     protected $tags = '';
 
     /**
      * @var float|null How much a single part unit weighs in gramms.
      * @ORM\Column(type="float", nullable=true)
+     * @ColumnSecurity(type="float", placeholder=null)
      * @Assert\PositiveOrZero()
      */
     protected $mass;
@@ -482,7 +490,7 @@ class Part extends AttachmentContainingDBElement
      *
      * @return Category the category of this part
      */
-    public function getCategory(): Category
+    public function getCategory(): ?Category
     {
         return $this->category;
     }
diff --git a/src/Form/Part/PartBaseType.php b/src/Form/Part/PartBaseType.php
index d9866f65..ff3769af 100644
--- a/src/Form/Part/PartBaseType.php
+++ b/src/Form/Part/PartBaseType.php
@@ -41,7 +41,6 @@ use App\Entity\Parts\Part;
 use App\Entity\Parts\Storelocation;
 use App\Entity\PriceInformations\Orderdetail;
 use App\Form\AttachmentFormType;
-use App\Form\AttachmentType;
 use App\Form\Type\SIUnitType;
 use App\Form\Type\StructuralEntityType;
 use Doctrine\DBAL\Types\FloatType;
@@ -122,7 +121,7 @@ class PartBaseType extends AbstractType
                 'required' => false,
                 'label' => $this->trans->trans('part.edit.footprint'),
                 'disable_not_selectable' => true,
-                'disabled' => !$this->security->isGranted('move', $part),
+                'disabled' => !$this->security->isGranted('footprint.edit', $part),
             ])
             ->add('tags', TextType::class, [
                 'required' => false,
diff --git a/src/Security/Annotations/ColumnSecurity.php b/src/Security/Annotations/ColumnSecurity.php
index 6a35eb39..7138410e 100644
--- a/src/Security/Annotations/ColumnSecurity.php
+++ b/src/Security/Annotations/ColumnSecurity.php
@@ -29,6 +29,7 @@
 
 namespace App\Security\Annotations;
 
+use App\Entity\Base\NamedDBElement;
 use Doctrine\Common\Annotations\Annotation;
 use Doctrine\Common\Collections\ArrayCollection;
 use \InvalidArgumentException;
@@ -90,10 +91,25 @@ class ColumnSecurity
 
     public function getPlaceholder()
     {
+        //Check if a class name was specified
+        if (class_exists($this->type)) {
+            $object = new $this->type();
+            if ($object instanceof NamedDBElement) {
+                if (is_string($this->placeholder) && $this->placeholder !== "") {
+                    $object->setName($this->placeholder);
+                }
+                $object->setName('???');
+            }
+            return $object;
+        }
+
+
         if (null === $this->placeholder) {
             switch ($this->type) {
                 case 'integer':
                     return 0;
+                case 'float':
+                    return 0.0;
                 case 'string':
                     return '???';
                 case 'object':
diff --git a/src/Security/EntityListeners/ElementPermissionListener.php b/src/Security/EntityListeners/ElementPermissionListener.php
index 63136691..011ff9b8 100644
--- a/src/Security/EntityListeners/ElementPermissionListener.php
+++ b/src/Security/EntityListeners/ElementPermissionListener.php
@@ -33,7 +33,11 @@ use App\Entity\Base\DBElement;
 use App\Security\Annotations\ColumnSecurity;
 use Doctrine\Common\Annotations\Reader;
 use Doctrine\Common\Persistence\Event\LifecycleEventArgs;
+use Doctrine\ORM\EntityManager;
+use Doctrine\ORM\EntityManagerInterface;
+use Doctrine\ORM\Event\PreFlushEventArgs;
 use Doctrine\ORM\Event\PreUpdateEventArgs;
+use Doctrine\ORM\Mapping as ORM;
 use Doctrine\ORM\Mapping\PostLoad;
 use Doctrine\ORM\Mapping\PreUpdate;
 use ReflectionClass;
@@ -50,11 +54,13 @@ class ElementPermissionListener
 {
     protected $security;
     protected $reader;
+    protected $em;
 
-    public function __construct(Security $security, Reader $reader)
+    public function __construct(Security $security, Reader $reader, EntityManagerInterface $em)
     {
         $this->security = $security;
         $this->reader = $reader;
+        $this->em = $em;
     }
 
     /**
@@ -80,7 +86,39 @@ class ElementPermissionListener
             //Check if user is allowed to read info, otherwise apply placeholder
             if ((null !== $annotation) && !$this->security->isGranted($annotation->getReadOperationName(), $element)) {
                 $property->setAccessible(true);
-                $property->setValue($element, $annotation->getPlaceholder());
+                $value = $annotation->getPlaceholder();
+                if($value instanceof DBElement) {
+                    $this->em->detach($value);
+                }
+                $property->setValue($element, $value);
+            }
+        }
+    }
+
+    /**
+     * @ORM\PreFlush()
+     * This function is called before flushing. We use it, to remove all placeholder DBElements (with name=???),
+     * so we dont get a no cascade persistance error.
+     */
+    public function preFlushHandler(DBElement $element, PreFlushEventArgs $eventArgs)
+    {
+        //$eventArgs->getEntityManager()->getUnitOfWork()->
+
+        $reflectionClass = new ReflectionClass($element);
+        $properties = $reflectionClass->getProperties();
+
+        foreach ($properties as $property) {
+            $annotation = $this->reader->getPropertyAnnotation(
+                $property,
+                ColumnSecurity::class
+            );
+            if (null !== $annotation) {
+                //Check if the current property is an DBElement
+                $property->setAccessible(true);
+                $value = $property->getValue($element);
+                if ($value instanceof DBElement && !$this->security->isGranted($annotation->getEditOperationName(), $element)) {
+                    $property->setValue($element, null);
+                }
             }
         }
     }
@@ -97,7 +135,7 @@ class ElementPermissionListener
 
         foreach ($properties as $property) {
             /**
-             * @var ColumnSecurity
+             * @var ColumnSecurity $annotation
              */
             $annotation = $this->reader->getPropertyAnnotation($property,
                 ColumnSecurity::class);
@@ -108,7 +146,8 @@ class ElementPermissionListener
                 //Check if user is allowed to edit info, otherwise overwrite the new value
                 // so that nothing is changed in the DB.
                 if ($event->hasChangedField($field_name) &&
-                    !$this->security->isGranted($annotation->getEditOperationName(), $element)) {
+                    (!$this->security->isGranted($annotation->getEditOperationName(), $element)
+                    || !$this->security->isGranted($annotation->getReadOperationName(), $element))) {
                     $event->setNewValue($field_name, $event->getOldValue($field_name));
                 }
             }
diff --git a/templates/Parts/info/_main_infos.html.twig b/templates/Parts/info/_main_infos.html.twig
index fdcc99e2..994bc659 100644
--- a/templates/Parts/info/_main_infos.html.twig
+++ b/templates/Parts/info/_main_infos.html.twig
@@ -11,7 +11,11 @@
     <div class="col-md-9">
         <h5 class="text-muted pt-2" title="{% trans %}manufacturer.label{% endtrans %}">
             {% if part.manufacturer %}
-                <a href="{{ part.manufacturer | entityURL('list_parts') }}">{{ part.manufacturer.name}}</a>
+                {% if part.manufacturer.id is not null %}
+                    <a href="{{ part.manufacturer | entityURL('list_parts') }}">{{ part.manufacturer.name}}</a>
+                {% else %}
+                    {{ part.manufacturer.name }}
+                {% endif %}
             {% endif %}
             {% if part.manufacturerProductUrl %}
                 <small>
diff --git a/templates/helper.twig b/templates/helper.twig
index 4118d0d6..c2160233 100644
--- a/templates/helper.twig
+++ b/templates/helper.twig
@@ -81,7 +81,7 @@
         <ul class="structural_link d-inline">
             {% for e in entity.pathArray %}
                 <li>
-                    {% if link_type is not empty %}
+                    {% if link_type is not empty and e.id is not null %}
                         <a href="{{ e | entityURL(link_type) }}">{{ e.name }}</a>
                     {% else %}
                         {{ e.name }}
@@ -99,7 +99,7 @@
         <ol class="breadcrumb">
             {% for e in entity.pathArray %}
                 <li class="breadcrumb-item {% if loop.last %}active{% endif %}">
-                    {% if link_type is not empty and not loop.last %}
+                    {% if link_type is not empty and not loop.last and e.id is not null %}
                         <a href="{{ e | entityURL(link_type) }}">{{ e.name }}</a>
                     {% else %}
                         {{ e.name }}