To reproduce: 

- Set autoBarcode = <branchcode>yymm0001
- Make sure you have a serial that is set to "create an item record when receiving this serial"
- Receive an issue
- Click in the barcode field - nothing happens

Bug 11273, attachment 42372 [details] [review] changes the logic around locating the barcode field in the item table from this:

-        for (i=0 ; i<document.f.field_value.length ; i++) {
-            if (document.f.tag[i].value == '$args->{loctag}' && document.f.subfield[i].value == '$args->{locsubfield}') {

To this:

+        var form = document.getElementById('f');
+        if ( !form ) {
+            form = document.getElementById('Aform');
+        }
+        for (i=0 ; i<form.field_value.length ; i++) {
+            if (form.tag[i].value == '$args->{loctag}' && form.subfield[i].value == '$args->{locsubfield}') {

This works for the item table that adds items to a bib record: 

<form id="f" method="post" action="/cgi-bin/koha/cataloguing/additem.pl" name="f">

but not for the item table that you get when receiving a serials issue, which is missing the id="f": 

<form method="post" name="f" action="serials-edit.pl" id="serials_edit">

Patch coming!