Hi,

Please refer to the code:

from odoo import models, fields, api

from odoo.exceptions import ValidationError

class StockProductionLot(models.Model):

    _inherit = 'stock.production.lot'

    quality_hold = fields.Boolean(string="Quality Hold", default=True)

class StockMoveLine(models.Model):

    _inherit = 'stock.move.line'

    @api.constrains('lot_id')

    def _check_quality_hold(self):

        for line in self:

            if line.lot_id and line.lot_id.quality_hold:

                raise ValidationError(

                    f"Lot {line.lot_id.name} is on quality hold and cannot be transacted."

                )

-All new lots are by default on quality_hold = True.

-Warehouse staff can locate them in their normal bin/location.

-Picking, delivery, and manufacturing consumption will be blocked until quality_hold is unchecked by Quality Control.

-Reporting: you can filter stock.production.lot by quality_hold to see all lots under QC.

Hope it helps.