Hi,

This behaviour is normal in Odoo, not an issue.

Reports generated from a wizard use a transient model, which stores temporary records.

After the report is created, Odoo automatically deletes the wizard record.

When you refresh the report page, Odoo tries to load the same wizard record again.

Since the record no longer exists, Odoo returns 404 Not Found.

Report URLs from wizards are not meant to be refreshed.

To avoid this, avoid refreshing the report page.

Or return a redirect action to another view after generating the report.

If you need a refresh-safe report, move the logic to a normal model instead of a transient model.

Another option is to generate the report through a custom controller that does not rely on transient records.

Hope it helps.