from odoo import models

class StockPicking(models.Model):
    _inherit = 'stock.picking'

    def _pre_action_done_hook(self):
        # Odoo 17 skips auto-setting `picked = True` if _any_ line was manually picked.
        # This causes unpicked lines with `quantity > 0` to be cancelled 
        # when the user selects "No Backorder", zeroing out their quantity.
        # We enforce that any line with quantity > 0 is treated as picked.
        for picking in self:
            for move in picking.move_ids:
                if move.quantity > 0 and not move.picked:
                    move.picked = True
        return super()._pre_action_done_hook()