Hi

Try the following code,

from odoo import models,api
class VehicleReport(models.AbstractModel):
    _name = 'report.vehicle.report_vehicle_order’
 
    @api.model
    def _get_report_values(self, docids, data=None):
        docs = self.env[model.model].browse(docids)
        return {
              'doc_ids': docids,
              'doc_model': model.model,
              'docs': docs,
              'data': data,
        }

For more reference, you can refer to the blog : https://www.cybrosys.com/blog/how-to-create-a-custom-pdf-report-in-odoo-16

Hope it helps