I can't change the default name for my pdf reports. It works if I do it in the settings but I don't want to do it this way. I tried by using report_name in my <report>
but it says that report_name is not an element of report. I can't figure out how to do it.
For set-up custom name of qweb report you can set attachment attribute of report.
Example is available if for invoice:
<report
id="account_invoices"
model="account.invoice"
string="Invoices"
report_type="qweb-pdf"
name="account.report_invoice"
file="account.report_invoice"
attachment_use="True"
attachment="(object.state in ('open','paid')) and ('INV'+(object.number or '').replace('/','')+'.pdf')"
/>
Try to use module : https://www.odoo.com/apps/modules/8.0/report_custom_filename/
Hope this helps.