diff --git a/Models/Arrival.php b/Models/Arrival.php
index cd10b2b..c0b7126 100644
--- a/Models/Arrival.php
+++ b/Models/Arrival.php
@@ -79,7 +79,7 @@ class Arrival
      * @var   \Modules\Warehousing\Models\ArrivalStatus
      * @since 1.0.0
      */
-    private $status = null;
+    private int $status = null;
 
     /* TODO: count, packaging, product count etc.... for every single position + where do you put it */
 
diff --git a/Models/Article.php b/Models/Article.php
index b3aac88..94a7f3b 100644
--- a/Models/Article.php
+++ b/Models/Article.php
@@ -1,4 +1,4 @@
-<?php declare(strict_types=1);
+<?php
 /**
  * Orange Management
  *
@@ -9,7 +9,9 @@
  * @license   OMS License 1.0
  * @version   1.0.0
  * @link      https://orange-management.org
- */ /* TODO: maybe make this a framework object? and let warehousing, sales, purchase extend this */
+ */
+declare(strict_types=1);
+ /* TODO: maybe make this a framework object? and let warehousing, sales, purchase extend this */
 namespace Modules\WarehouseManagement\Models;
 
 /**
diff --git a/Models/Shipping.php b/Models/Shipping.php
index 8328d2b..5a02b11 100644
--- a/Models/Shipping.php
+++ b/Models/Shipping.php
@@ -79,7 +79,7 @@ class Shipping
      * @var   \Modules\Warehousing\Models\ArrivalStatus
      * @since 1.0.0
      */
-    private $status = null;
+    private int $status = null;
 
     /**
      * Shipping.
diff --git a/Theme/Backend/Lang/Navigation.en.lang.php b/Theme/Backend/Lang/Navigation.en.lang.php
index 9787e03..3d077b2 100644
--- a/Theme/Backend/Lang/Navigation.en.lang.php
+++ b/Theme/Backend/Lang/Navigation.en.lang.php
@@ -1,4 +1,4 @@
-<?php declare(strict_types=1);
+<?php
 /**
  * Orange Management
  *
@@ -10,6 +10,8 @@
  * @version   1.0.0
  * @link      https://orange-management.org
  */
+declare(strict_types=1);
+
 return ['Navigation' => [
     'Arrival'     => 'Arrival',
     'Articles'    => 'Articles',
diff --git a/Theme/Backend/Lang/api.en.lang.php b/Theme/Backend/Lang/api.en.lang.php
index 4ca4bb1..2557a9e 100644
--- a/Theme/Backend/Lang/api.en.lang.php
+++ b/Theme/Backend/Lang/api.en.lang.php
@@ -1,4 +1,4 @@
-<?php declare(strict_types=1);
+<?php
 /**
  * Orange Management
  *
@@ -10,5 +10,7 @@
  * @version   1.0.0
  * @link      https://orange-management.org
  */
+declare(strict_types=1);
+
 $MODLANG[1] = [
 ];
diff --git a/Theme/Backend/Lang/en.lang.php b/Theme/Backend/Lang/en.lang.php
index 781e69f..dc0fc19 100644
--- a/Theme/Backend/Lang/en.lang.php
+++ b/Theme/Backend/Lang/en.lang.php
@@ -1,4 +1,4 @@
-<?php declare(strict_types=1);
+<?php
 /**
  * Orange Management
  *
@@ -10,6 +10,8 @@
  * @version   1.0.0
  * @link      https://orange-management.org
  */
+declare(strict_types=1);
+
 return ['WarehouseManagement' => [
     'All'         => 'All',
     'Amount'      => 'Amount',