In the overview of warehouse, I want to have an entry under the button 'Print', which appears when selecting one or more delivery orders. It should allow me to select multiple deliveries, and print them all at once, instead of printing one by one.....

In the various questions, they tell you to make a report in an XML file, which points to the report you want to use. I want to use the default report, so I think I should not change anything regarding the RML file or the parser.

When copying from production the report for account.invoice (/addons/account/account_report.xml), I do get another entry under the print button, with the string I specified. But when I copy the report for the delivery order (/addons/delivery/delivery_report.xml), I do not see another entry under the print button.

When checking the reports at Settings -> Actions -> Reports, I do see an entry with my title.

The log file does show it is reading/loading the file which contains my reports, so I know it is read.

What did I forget to do or change?

The xml-definition file, with the invoices first (which do show up under the print button) and the Delivery orders as second report.

<?xml version="1.0"?>
<openerp>
  <data>
    <report
        id="account_invoices"
        string="Invoices Testing"
        model="account.invoice"
        name="account.invoice"
        rml="account/report/account_print_invoice.rml"
        auto="False"
        usage="default"
    />

    <report
        id="report_shipping"
        model="stock.picking"
        name="sale.shipping"
        multi="True"
        rml="delivery/report/shipping.rml"
        string="Delivery order Testing"
    />
  </data>
</openerp>