diff --git a/Layout/default/Product/Index.php b/Layout/default/Product/Index.php
index 25a0e0dbd..dfc84dc25 100644
--- a/Layout/default/Product/Index.php
+++ b/Layout/default/Product/Index.php
@@ -158,8 +158,8 @@
                 <td><?=$product->ivt_id?></td>
                 <td style="text-align: left; letter-spacing: 4px; font-size: 1.1em;">
                   <a href="<?=self::getUrl("Product", "edit", ["id" => $product->id])?>"><i class="far fa-edit"  title="Produkt Bearbeiten"></i></a>
-                  <a href="<?=self::getUrl("Product", "copy", ["id" => $product->id])?>"><i class="far fa-clone"  title="Kopie erstellen"></i></a>
-                  <a href="<?=self::getUrl("Product", "delete", ["id" => $product->id])?>" class="text-danger" onclick="if(!confirm('Berechtigungen wirklich löschen?')) return false;" title="Produkt Löschen"><i class="fas fa-trash"></i></a>
+                  <a href="<?=self::getUrl("Product", "copy", ["id" => $product->id])?>"  onclick="if(!confirm('Wirklich Kopie erstellen?')) return false;"><i class="far fa-clone"  title="Kopie erstellen"></i></a>
+                  <a href="<?=self::getUrl("Product", "delete", ["id" => $product->id])?>" class="text-danger" onclick="if(!confirm('Produkt wirklich löschen?')) return false;" title="Produkt Löschen"><i class="fas fa-trash"></i></a>
                 </td>
               </tr>
               <?php endforeach; ?>
diff --git a/application/Contract/ContractModel.php b/application/Contract/ContractModel.php
index cb1856594..24e4591fb 100644
--- a/application/Contract/ContractModel.php
+++ b/application/Contract/ContractModel.php
@@ -154,7 +154,7 @@ class ContractModel {
     return null;
   }
   
-  public static function count($filter) {
+  public static function countActive($filter) {
     $db = FronkDB::singleton();
     
     $where = self::getSqlFilter($filter);
@@ -215,6 +215,30 @@ class ContractModel {
     return $items;
   }
   
+  public static function count($filter) {
+    $db = FronkDB::singleton();
+    
+    $where = self::getSqlFilter($filter);
+    $sql = "SELECT COUNT(*) as cnt FROM (
+            SELECT Contract.* FROM Contract
+            LEFT JOIN Address ON (Contract.owner_id = Address.id)
+            LEFT JOIN OrderProduct ON (Contract.orderproduct_id = OrderProduct.id)
+            LEFT JOIN `Order` ON (OrderProduct.order_id = `Order`.id)
+            LEFT JOIN Product ON (Contract.product_id = Product.id)
+            WHERE $where
+            GROUP BY Contract.id
+            ) contract";
+    
+    mfLoghandler::singleton()->debug($sql);
+    
+    $res = $db->query($sql);
+    if($db->num_rows($res)) {
+      $data = $db->fetch_object($res);
+      return $data->cnt;
+    }
+    return 0;
+  }
+  
   public static function search($filter, $limit = false) {
     //var_dump($filter);exit;
     $items = [];
diff --git a/application/OrderProduct/OrderProductModel.php b/application/OrderProduct/OrderProductModel.php
index 0af892007..bcfa395b3 100644
--- a/application/OrderProduct/OrderProductModel.php
+++ b/application/OrderProduct/OrderProductModel.php
@@ -100,7 +100,25 @@ class OrderProductModel
         }
         return null;
     }
+    
+    public static function count($filter) {
+      $db = FronkDB::singleton();
 
+      $where = self::getSqlFilter($filter);
+      $sql = "SELECT COUNT(*) as cnt FROM OrderProduct
+              WHERE $where
+        ";
+
+      mfLoghandler::singleton()->debug($sql);
+
+      $res = $db->query($sql);
+      if($db->num_rows($res)) {
+        $data = $db->fetch_object($res);
+        return $data->cnt;
+      }
+      return 0;
+    }
+    
     public static function search($filter)
     {
         $items = [];
@@ -187,7 +205,7 @@ class OrderProductModel
         if (array_key_exists("product_id", $filter)) {
             $product_id = $filter['product_id'];
             if (is_numeric($product_id)) {
-                $where .= " AND order_id=$product_id";
+                $where .= " AND product_id=$product_id";
             }
         }
 
diff --git a/application/Preorder/PreorderModel.php b/application/Preorder/PreorderModel.php
index f63475731..a294f6847 100644
--- a/application/Preorder/PreorderModel.php
+++ b/application/Preorder/PreorderModel.php
@@ -544,6 +544,20 @@ class PreorderModel {
       }
     }
     
+    if(array_key_exists("product_id", $filter)) {
+      $product_id = $filter['product_id'];
+      if(is_numeric($product_id)) {
+        $where .= " AND tt_preorder.product_id=$product_id";
+      }
+    }
+    
+    if(array_key_exists("setup_product_id", $filter)) {
+      $setup_product_id = $filter['setup_product_id'];
+      if(is_numeric($setup_product_id)) {
+        $where .= " AND tt_preorder.setup_product_id=$setup_product_id";
+      }
+    }
+    
     if(array_key_exists("address_created", $filter)) {
       $address_created = $filter['address_created'];
       if($address_created === true) {
@@ -610,6 +624,8 @@ class PreorderModel {
       }
     }
     
+    
+    
     if(array_key_exists("extref", $filter)) {
       $extref = FronkDB::singleton()->escape($filter['extref']);
       if($extref) {
diff --git a/application/Product/ProductController.php b/application/Product/ProductController.php
index 731d17f62..ef758bd55 100644
--- a/application/Product/ProductController.php
+++ b/application/Product/ProductController.php
@@ -312,8 +312,39 @@ class ProductController extends mfBaseController {
       $this->redirect("Product");
     }
     
-    // check if Product is unused
+    // check if product is in use
+    if(OrderProductModel::count(["product_id" => $product->id])) {
+      $this->layout()->setFlash("Produkt kann nicht gelöscht werden, da es in Verwendung ist!", "error");
+      $this->redirect("Product");
+    }
+    
+    if(ContractModel::count(["product_id" => $product->id])) {
+      $this->layout()->setFlash("Produkt kann nicht gelöscht werden, da es in Verwendung ist!", "error");
+      $this->redirect("Product");
+    }
+    
+    if(ContractqueueModel::count(["product_id" => $product->id])) {
+      $this->layout()->setFlash("Produkt kann nicht gelöscht werden, da es in Verwendung ist!", "error");
+      $this->redirect("Product");
+    }
+    
+    if(PreorderModel::count(["product_id" => $product->id]) || PreorderModel::count(["setup_product_id" => $product->id])) {
+      $this->layout()->setFlash("Produkt kann nicht gelöscht werden, da es in Verwendung ist!", "error");
+      $this->redirect("Product");
+    }
+    
+    // delete attributes
+    foreach($product->attributes as $attrib) {
+      $attrib->delete();
+    }
+    // delete networks
+    foreach(ProductNetworkModel::search(['product_id' => $product->id]) as $pn) {
+      $pn->delete();
+    }
+    
+    // delete product
     $product->delete();
+    $this->layout()->setFlash("Produkt erfolgreich gelöscht", "success");
     $this->redirect("Product");
   }