diff --git a/htdocs/core/class/html.formpropal.class.php b/htdocs/core/class/html.formpropal.class.php
index e23e71a8124..7cce3c839c5 100644
--- a/htdocs/core/class/html.formpropal.class.php
+++ b/htdocs/core/class/html.formpropal.class.php
@@ -1,5 +1,6 @@
 <?php
 /* Copyright (C) 2012 Laurent Destailleur   <eldy@users.sourceforge.net>
+ * Copyright (C) 2022 Josep Lluís Amador	<joseplluis@lliuretic.cat>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -132,6 +133,14 @@ class FormPropal
 			print '</option>';
 			$i++;
 		}
+		//Option for Signed+Billed
+		if ($selected != '' && $selected == "2,4") {
+			print '<option value="2,4" selected>';
+		} else {
+			print '<option value="2,4">';
+		}
+		print ($langs->trans($prefix.'Signed'.($short ? 'Short' : '')).' '.$langs->trans("or").' '.$langs->trans($prefix.'Billed'.($short ? 'Short' : '')));
+		print '</option>';
 		print '</select>';
 
 		print ajax_combobox($htmlname, array(), 0, 0, 'resolve', ($showempty < 0 ? (string) $showempty : '-1'), $morecss);