Hi,

By default in Odoo Quality, a quality.check record stays editable even after it has a result (Pass/Fail) or worksheet data. Odoo doesn’t automatically lock them. 

3 ways:

1. Security Group:

You can create a record rule that prevents write access on quality.check once certain conditions are met.

Example condition: only allow editing if quality_state = 'none' (not yet processed).

<record id="rule_quality_check_no_edit_done" model="ir.rule">

    <field name="name">No edit on done quality checks</field>

    <field name="model_id" ref="quality_control.model_quality_check"/>

    <field name="groups" eval="[(4, ref('quality_control.group_quality_user'))]"/>

    <field name="domain_force">[('quality_state', '!=', 'none')]</field>

    <field name="perm_read" eval="True"/>

    <field name="perm_write" eval="False"/>

    <field name="perm_create" eval="True"/>

    <field name="perm_unlink" eval="False"/>

</record>

Or

2. Python Code

Override the write method in a custom module, and raise an error if someone tries to edit a filled check:

from odoo import models, exceptions, _

class QualityCheck(models.Model):

    _inherit = "quality.check"

    def write(self, vals):

        for rec in self:

            if rec.quality_state != 'none':  # already processed

                raise exceptions.UserError(

                    _("You cannot modify a quality check once it has been filled.")

                )

        return super().write(vals)

Or

3. View Customization

You can make the form view read-only once filled by using a domain in Readonly:

<field name="quality_state" readonly="quality_state != 'none'"/>

Hope it helps.