Index: /views/mods/mod_rechnungen/order_view_orderdata_after.phtml
===================================================================
--- /views/mods/mod_rechnungen/order_view_orderdata_after.phtml	(revision 8389)
+++ /views/mods/mod_rechnungen/order_view_orderdata_after.phtml	(revision 8390)
@@ -183,7 +183,13 @@
                         let el_invoice_wpsg_rechnungen_preview = document.getElementById('invoice_wpsg_rechnungen_preview');
                         let el_invoice_wpsg_rechnungen_submit = document.getElementById('invoice_wpsg_rechnungen_submit');
-                                                                
+                        
+						let submit = false;
+						
 						function check_invoice_amount(event) {
-							 
+							
+							if (submit === true) return;
+							
+							submit = true;
+							
 							let ok = false;
 							
@@ -203,5 +209,5 @@
 							
 							if (ok) {
-
+								
 								if (event.target.getAttribute("id") === 'invoice_wpsg_rechnungen_submit') {
                                         
@@ -215,4 +221,6 @@
 									
 							} else {
+								
+								submit = false;
 								
 								alert('<?php echo __('Bitte mindestens ein Produkt auswÀhlen!', 'wpsg'); ?>');