Context: in 17.0 we enabled mass download for invoices. We expect this download to create a zip with all PDF invoices and their related xml files. Steps to reproduce: 1. Install l10n_fr 2. Create two invoices to french partners 3. Send & Print the two invoices and select 'Factur-x" and "Download" 4. A .zip file is generated with two PDF but only **one** XML file "factur-x.xml" Cause: The name of the XML file for the factur-x XML file is not specific to related invoice, it gets overriden each time it is generated. closes odoo/odoo#162406 See: https://github.com/odoo/odoo/pull/137382 Signed-off-by: Laurent Smet (las) <las@odoo.com>