diff --git a/Layout/default/PreorderBilling/Index.php b/Layout/default/PreorderBilling/Index.php
index 64aa5eb97..c2d25196a 100644
--- a/Layout/default/PreorderBilling/Index.php
+++ b/Layout/default/PreorderBilling/Index.php
@@ -127,7 +127,7 @@ $pagination_entity_name = "Billingrecords";
                                 <?php if(PreorderBilling::count(["invoice_id" => false])): ?>
                                 <div class="row">
                                     <div class="col">
-                                        <a class="btn btn-primary mb-2" href="<?=self::getUrl("PreorderBillingInvoice", "create")?>">
+                                        <a class="btn btn-primary mb-2" href="<?=self::getUrl("PreorderBillingInvoice", "create")?>" onclick="if(!confirm('Rechnungen jetzt erstellen? Dieser Schritt kann nicht rückgängig gemacht werden!')) return false;">
                                             <i class="far fa-fw fa-file-invoice"></i> Rechnungen erstellen
                                         </a>
                                     </div>