diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/acqui/invoices.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/acqui/invoices.tt
index 20d5edba26..9755488a89 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/acqui/invoices.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/acqui/invoices.tt
@@ -66,8 +66,7 @@ $(document).ready(function() {
                 $(row).click(function () {
                     $('#merge_table tbody tr').removeClass('active');
                     $(this).addClass('active');
-                    $('#merge_invoicenumber').text(invoice.invoicenumber);
-                    $.each(['invoiceid', 'shipmentdate', 'billingdate', 'shipmentcost', 'shipment_budgetid'], function (idx, prop) {
+                    $.each(['invoiceid', 'shipmentdate', 'billingdate', 'shipmentcost', 'shipment_budgetid', 'invoicenumber'], function (idx, prop) {
                         $('#merge_' + prop).val(invoice[prop]);
                     });
                     if (invoice.closedate) {
@@ -183,7 +182,10 @@ $(document).ready(function() {
                         <tbody>
                         </tbody>
                     </table></li>
-                    <li><label for="merge_invoicenumber">Invoice number:</label><span id="merge_invoicenumber"></span></li>
+                    <li><label for="merge_invoicenumber">Invoice number:</label>
+                            <input type="text" size="10" id="merge_invoicenumber" name="invoicenumber" value="" class="required" required="required" />
+                            <span class="required">Required</span>
+                            </li>
                     <li><label for="merge_shipmentdate">Shipment date:</label>
                             <input type="text" size="10" id="merge_shipmentdate" name="shipmentdate" value="" class="datepicker" /></li>