diff --git a/services/nginx/app/objects/collected_order_invoices_o.php b/services/nginx/app/objects/collected_order_invoices_o.php
index 5e0329d0..95ef8272 100644
--- a/services/nginx/app/objects/collected_order_invoices_o.php
+++ b/services/nginx/app/objects/collected_order_invoices_o.php
@@ -101,7 +101,7 @@ class collected_order_invoices_o extends db
         // Check if the object is cached
         $cached = self::getCached('asArray', $this->id);
         if ($cached !== null) {
-            return (array)$cached;
+            //return (array)$cached;
         }
         $tmp = [
             'id' => (int)$this->id,
@@ -170,6 +170,9 @@ class collected_order_invoices_o extends db
         foreach ( $order_ids as $order_id ) {
             $orders->select($order_id['id']);
             $orders->requireSelected();
+            if (!$orders->isIncludedInInvoicing()) {
+                continue;
+            }
             $result[] = $orders->asArray();
         }
         return $result;
@@ -194,6 +197,9 @@ class collected_order_invoices_o extends db
             $order = new orders_o();
             $order->select($order_id['id']);
             $order->requireSelected();
+            if (!$order->isIncludedInInvoicing()) {
+                continue;
+            }
             // Get the net amount of the order
             $net_amount += $order->getNetAmount();
         }
@@ -211,13 +217,22 @@ class collected_order_invoices_o extends db
         self::requireSelected();
         // Get the orders in the invoice collection
         $orders_o = new orders_o();
-        return $orders_o->getFieldsWhere(
+        $fields = $orders_o->getFieldsWhere(
             [
                 'invoice_collection_id' => $this->id,
                 'deleted_at' => null
             ],
             ['id']
         );
+        // Remove all orders that are not included in invoicing
+        foreach ( $fields as $key => $order ) {
+            $orders_o->select($order['id']);
+            $orders_o->requireSelected();
+            if (!$orders_o->isIncludedInInvoicing()) {
+                unset($fields[$key]);
+            }
+        }
+        return $fields;
     }
 
     /**
diff --git a/services/nginx/app/objects/orders_o.php b/services/nginx/app/objects/orders_o.php
index ca49b546..72f9cf7a 100644
--- a/services/nginx/app/objects/orders_o.php
+++ b/services/nginx/app/objects/orders_o.php
@@ -1389,4 +1389,16 @@ class orders_o extends db
         $this->select((int)$new_order->id);
         return $this;
     }
+
+    /**
+     * If the transaction should be included in invoicing, based on the department.
+     * Some departments have a setting to exclude them from invoicing.
+     * @return bool
+     * @throws Exception If the order is not selected
+     */
+    public function isIncludedInInvoicing(): bool
+    {
+        self::requireSelected();
+        return !(new departments_o())->select((int)$this->department_id->value())->isExcludedFromInvoicing();
+    }
 }
\ No newline at end of file
diff --git a/services/nginx/app/routes/InvoicingPeriodRoute.php b/services/nginx/app/routes/InvoicingPeriodRoute.php
index 789cf586..c3d8ef32 100644
--- a/services/nginx/app/routes/InvoicingPeriodRoute.php
+++ b/services/nginx/app/routes/InvoicingPeriodRoute.php
@@ -750,6 +750,7 @@ class InvoicingPeriodRoute
             'date' => $transaction->created_at->value(),
             'amount' => $transaction->temporary_net_amount, // Use the temporary net amount set earlier
             'booked' => $transaction->isBooked(),
+            'excluded' => !$transaction->isIncludedInInvoicing()
         ];
     }
 
@@ -761,7 +762,7 @@ class InvoicingPeriodRoute
         }
         // Check if any transaction is not booked
         foreach ( $parsed_transactions as $transaction ) {
-            if (!$transaction['booked']) {
+            if (!$transaction['booked'] && !$transaction['excluded']) {
                 return true;
             }
         }