text: from odoo import models, fields, api
  
  
  class StockImmediateTransfer(models.TransientModel):
      _inherit = 'stock.immediate.transfer'
      _description = 'Immediate Transfer'
  
      pick_to_backorder_ids = fields.Many2many('stock.picking', help='Picking to backorder')
  
      def process(self):
          backorder_wizard_dict = super(StockImmediateTransfer, self).process()
          # If the immediate transfer wizard process all our picking but with some back order maybe needed we want to add the backorder already passed to the wizard.
          if backorder_wizard_dict:
              backorder_wizard = self.env['stock.backorder.confirmation'].browse(backorder_wizard_dict.get('res_id', False))
              backorder_wizard.write({'pick_ids': [(4, p.id) for p in self.pick_to_backorder_ids]})
              return backorder_wizard_dict
          # If there is no backorder returned by the immediate transfer basic function we still wanted to process those manually given
          elif self.pick_to_backorder_ids:
              return self.pick_to_backorder_ids.action_generate_backorder_wizard()
          return False
  