diff --git a/Layout/default/Product/Index.php b/Layout/default/Product/Index.php
index 7243c0017..cfcc3d38f 100644
--- a/Layout/default/Product/Index.php
+++ b/Layout/default/Product/Index.php
@@ -63,7 +63,7 @@
                 
                 <div class="col-2">
                   <label class="form-label" for="filter_external_id">Produktbesitzer</label>
-                  <select class="select2 form-control" name="external_id" id="filter_external_id">
+                  <select class="select2 form-control" name="filter[external_id]" id="filter_external_id">
                     <option></option>
                     <?php foreach(AddressModel::search(['addresstype' => ['productowner']]) as $owner): ?>
                     <option value="<?=$owner->id?>" <?=(is_array($filter) && array_key_exists('external_id', $filter) && $filter['external_id'] == $owner->id) ? "selected='selected'" : ""?>><?=$owner->getCompanyOrName()?></option>
diff --git a/application/Product/ProductController.php b/application/Product/ProductController.php
index 5f8d385ea..fe3f4dbc4 100644
--- a/application/Product/ProductController.php
+++ b/application/Product/ProductController.php
@@ -32,7 +32,7 @@ class ProductController extends mfBaseController {
         $filter = $_SESSION[MFAPPNAME.'-Product-filter'];
       }
     }
-    
+    //var_dump($filter);
     $this->layout->set("filter", $filter);
     $filter = $this->getPreparedFilter($filter);
     
@@ -46,7 +46,7 @@ class ProductController extends mfBaseController {
     if(is_numeric($this->request->s)) {
       $pagination['start'] = intval($this->request->s);
     }
-    
+    //var_dump($filter);exit;
     $pagination['maxItems'] = ProductModel::count($filter);
     $this->layout()->set("pagination", $pagination);
     
diff --git a/application/Product/ProductModel.php b/application/Product/ProductModel.php
index 873aa3192..f19113951 100644
--- a/application/Product/ProductModel.php
+++ b/application/Product/ProductModel.php
@@ -228,6 +228,15 @@ class ProductModel {
       }
     }
     
+    if(array_key_exists("external_id", $filter)) {
+      $external_id = $filter['external_id'];
+      if(is_numeric($external_id)) {
+        $where .= " AND external_id=$external_id";
+      } elseif(is_array($external_id) && count($external_id)) {
+        $where .= " AND Product.external_id IN (". implode(",", $external_id).")";
+      }
+    }
+    
     if(array_key_exists("external", $filter)) {
       $external = $filter['external'];
       if(is_numeric($external)) {