[ADD] stock_vertical_lift_empty_tray_check: is the tray empty?

A vertical lift retrieves a tray and places it in front of the
user, and depending on the quantity the user takes from it,
it adapts the pending quantity in the tray. However, because of
errors, it could be that the system thinks the tray is empty
while it is not. With this module, when the system thinks the
tray is empty, while in the step for the release of the tray
the operator is asked explicitly to check if the tray is
actually empty. Depending on his/her answer (yes/no) an inventory
adjustment is created stating the situation.

To activate this optional feature, a new configuration setting
has been added to Inventory > Configuration > Settings, named
'Check Empty Tray'. It is deactivated by default.

Developing decisions:
- The screens shown to the operator are actually wizards, but
  since in the original module (`stock_vertical_lift`) they
  were considered (on the source tree) as views, this has been
  continued here.
- It has been decided, to not change the current workflow of
  the operators, to embed the new check inside the step for
  the 'release'. So, a new screen is shown to ask for the
  visual inspection of whether the tray is empty. In
  order to test this easily, the method `button_release` of
  the module `stock_vertical_lift` has been slightly modified
  so that it always returns. This way we can check easily
  in the unit-tests for the outcome of the intermediate
  screen (i.e. wizard) ─ similarly to how it is done when
  validating a picking that can result in a backorder.

stock_vertical_lift_empty_tray_check/README.rst

@@ -0,0 +1,90 @@
+==============================
+Vertical Lift Empty Tray Check
+==============================
+
+.. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! This file is generated by oca-gen-addon-readme !!
+   !! changes will be overwritten.                   !!
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+.. |badge1| image:: https://img.shields.io/badge/maturity-Alpha-red.png
+    :target: https://odoo-community.org/page/development-status
+    :alt: Alpha
+.. |badge2| image:: https://img.shields.io/badge/licence-AGPL--3-blue.png
+    :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+    :alt: License: AGPL-3
+.. |badge3| image:: https://img.shields.io/badge/github-OCA%2Fstock--logistics--warehouse-lightgray.png?logo=github
+    :target: https://github.com/OCA/stock-logistics-warehouse/tree/13.0/stock_vertical_lift_empty_tray_check
+    :alt: OCA/stock-logistics-warehouse
+.. |badge4| image:: https://img.shields.io/badge/weblate-Translate%20me-F47D42.png
+    :target: https://translation.odoo-community.org/projects/stock-logistics-warehouse-13-0/stock-logistics-warehouse-13-0-stock_vertical_lift_empty_tray_check
+    :alt: Translate me on Weblate
+.. |badge5| image:: https://img.shields.io/badge/runbot-Try%20me-875A7B.png
+    :target: https://runbot.odoo-community.org/runbot/153/13.0
+    :alt: Try me on Runbot
+
+|badge1| |badge2| |badge3| |badge4| |badge5| 
+
+When a tray is released, and the system thinks it is empty,
+it prompts the user to actually check that it is empty or not.
+In any case, an inventory adjustment is done stating the
+situation: posted to zero if the tray is actually empty, and
+set to draft is it is not empty.
+
+.. IMPORTANT::
+   This is an alpha version, the data model and design can change at any time without warning.
+   Only for development or testing purpose, do not use in production.
+   `More details on development status <https://odoo-community.org/page/development-status>`_
+
+**Table of contents**
+
+.. contents::
+   :local:
+
+Configuration
+=============
+
+General
+~~~~~~~
+
+In Inventory Settings, you must have activated the option: *Check Empty Tray*
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/OCA/stock-logistics-warehouse/issues>`_.
+In case of trouble, please check there if your issue has already been reported.
+If you spotted it first, help us smashing it by providing a detailed and welcomed
+`feedback <https://github.com/OCA/stock-logistics-warehouse/issues/new?body=module:%20stock_vertical_lift_empty_tray_check%0Aversion:%2013.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**>`_.
+
+Do not contact contributors directly about support or help with technical issues.
+
+Credits
+=======
+
+Authors
+~~~~~~~
+
+* Camptocamp
+
+Contributors
+~~~~~~~~~~~~
+
+* Carlos Serra-Toro <carlos.serra@camptocamp.com>
+
+Maintainers
+~~~~~~~~~~~
+
+This module is maintained by the OCA.
+
+.. image:: https://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: https://odoo-community.org
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.
+
+This module is part of the `OCA/stock-logistics-warehouse <https://github.com/OCA/stock-logistics-warehouse/tree/13.0/stock_vertical_lift_empty_tray_check>`_ project on GitHub.
+
+You are welcome to contribute. To learn how please visit https://odoo-community.org/page/Contribute.

stock_vertical_lift_empty_tray_check/__init__.py

@@ -0,0 +1,3 @@
+# Copyright 2021 Camptocamp SA
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html)
+from . import models

stock_vertical_lift_empty_tray_check/__manifest__.py

@@ -0,0 +1,18 @@
+# Copyright 2021 Camptocamp SA
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html)
+{
+    "name": "Vertical Lift Empty Tray Check",
+    "summary": "Checks if the tray is actually empty.",
+    "version": "13.0.1.1.0",
+    "category": "Stock",
+    "author": "Camptocamp, Odoo Community Association (OCA)",
+    "license": "AGPL-3",
+    "depends": ["stock", "stock_vertical_lift"],
+    "website": "https://github.com/OCA/stock-logistics-warehouse",
+    "data": [
+        "views/res_config_setting_views.xml",
+        "views/vertical_lift_operation_pick_zero_check_views.xml",
+    ],
+    "installable": True,
+    "development_status": "Alpha",
+}

stock_vertical_lift_empty_tray_check/i18n/stock_vertical_lift_empty_tray_check.pot

@@ -0,0 +1,94 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* stock_vertical_lift_empty_tray_check
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 13.0\n"
+"Report-Msgid-Bugs-To: \n"
+"Last-Translator: \n"
+"Language-Team: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: \n"
+"Plural-Forms: \n"
+
+#. module: stock_vertical_lift_empty_tray_check
+#: model:ir.model,name:stock_vertical_lift_empty_tray_check.model_res_config_settings
+msgid "Config Settings"
+msgstr ""
+
+#. module: stock_vertical_lift_empty_tray_check
+#: model:ir.model.fields,field_description:stock_vertical_lift_empty_tray_check.field_vertical_lift_operation_pick_zero_check__create_uid
+msgid "Created by"
+msgstr ""
+
+#. module: stock_vertical_lift_empty_tray_check
+#: model:ir.model.fields,field_description:stock_vertical_lift_empty_tray_check.field_vertical_lift_operation_pick_zero_check__create_date
+msgid "Created on"
+msgstr ""
+
+#. module: stock_vertical_lift_empty_tray_check
+#: model:ir.model.fields,field_description:stock_vertical_lift_empty_tray_check.field_vertical_lift_operation_pick_zero_check__display_name
+msgid "Display Name"
+msgstr ""
+
+#. module: stock_vertical_lift_empty_tray_check
+#: model:ir.model.fields,field_description:stock_vertical_lift_empty_tray_check.field_vertical_lift_operation_pick_zero_check__id
+msgid "ID"
+msgstr ""
+
+#. module: stock_vertical_lift_empty_tray_check
+#: model_terms:ir.ui.view,arch_db:stock_vertical_lift_empty_tray_check.res_config_settings_view_form
+msgid ""
+"If checked and the system thinks the vertical tray is\n"
+"                                empty, the operator will be asked to explicitly check\n"
+"                                if this is the case or not"
+msgstr ""
+
+#. module: stock_vertical_lift_empty_tray_check
+#: code:addons/stock_vertical_lift_empty_tray_check/models/vertical_lift_operation_pick.py:0
+#, python-format
+msgid "Is the tray empty?"
+msgstr ""
+
+#. module: stock_vertical_lift_empty_tray_check
+#: model:ir.model.fields,field_description:stock_vertical_lift_empty_tray_check.field_vertical_lift_operation_pick_zero_check____last_update
+msgid "Last Modified on"
+msgstr ""
+
+#. module: stock_vertical_lift_empty_tray_check
+#: model:ir.model.fields,field_description:stock_vertical_lift_empty_tray_check.field_vertical_lift_operation_pick_zero_check__write_uid
+msgid "Last Updated by"
+msgstr ""
+
+#. module: stock_vertical_lift_empty_tray_check
+#: model:ir.model.fields,field_description:stock_vertical_lift_empty_tray_check.field_vertical_lift_operation_pick_zero_check__write_date
+msgid "Last Updated on"
+msgstr ""
+
+#. module: stock_vertical_lift_empty_tray_check
+#: model:ir.model,name:stock_vertical_lift_empty_tray_check.model_vertical_lift_operation_pick_zero_check
+msgid "Make sure the tray location is empty"
+msgstr ""
+
+#. module: stock_vertical_lift_empty_tray_check
+#: model_terms:ir.ui.view,arch_db:stock_vertical_lift_empty_tray_check.vertical_lift_operation_pick_zero_check_view_form
+msgid "Tray Empty"
+msgstr ""
+
+#. module: stock_vertical_lift_empty_tray_check
+#: model_terms:ir.ui.view,arch_db:stock_vertical_lift_empty_tray_check.vertical_lift_operation_pick_zero_check_view_form
+msgid "Tray Not Empty"
+msgstr ""
+
+#. module: stock_vertical_lift_empty_tray_check
+#: model:ir.model,name:stock_vertical_lift_empty_tray_check.model_vertical_lift_operation_pick
+#: model:ir.model.fields,field_description:stock_vertical_lift_empty_tray_check.field_vertical_lift_operation_pick_zero_check__vertical_lift_operation_pick_id
+msgid "Vertical Lift Operation Pick"
+msgstr ""
+
+#. module: stock_vertical_lift_empty_tray_check
+#: model:ir.model.fields,field_description:stock_vertical_lift_empty_tray_check.field_res_config_settings__vertical_lift_empty_tray_check
+msgid "Vertical lift: Check Empty Tray"
+msgstr ""

stock_vertical_lift_empty_tray_check/models/__init__.py

@@ -0,0 +1,5 @@
+# Copyright 2021 Camptocamp SA
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl)
+from . import res_config_settings
+from . import vertical_lift_operation_pick
+from . import vertical_lift_operation_pick_zero_check

stock_vertical_lift_empty_tray_check/models/res_config_settings.py

@@ -0,0 +1,11 @@
+from odoo import fields, models
+
+
+class ResConfigSettings(models.TransientModel):
+    _inherit = "res.config.settings"
+
+    vertical_lift_empty_tray_check = fields.Boolean(
+        "Vertical lift: Check Empty Tray",
+        default=False,
+        config_parameter="vertical_lift_empty_tray_check",
+    )

stock_vertical_lift_empty_tray_check/models/vertical_lift_operation_pick.py

@@ -0,0 +1,46 @@
+# Copyright 2019 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import _, models
+from odoo.tools import float_is_zero
+
+
+class VerticalLiftOperationPick(models.Model):
+    _inherit = "vertical.lift.operation.pick"
+
+    def button_release(self):
+        """Release the operation, go to the next
+
+        By default it asks the user to inspect visually if the tray is empty.
+        """
+        icp = self.env["ir.config_parameter"].sudo()
+        tray_check = icp.get_param("vertical_lift_empty_tray_check")
+        skip_zero_quantity_check = self.env.context.get("skip_zero_quantity_check")
+        if not skip_zero_quantity_check and tray_check:
+            uom_rounding = self.product_id.uom_id.rounding
+            if float_is_zero(self.tray_qty, precision_rounding=uom_rounding):
+                return self._check_zero_quantity()
+
+        return super().button_release()
+
+    def _check_zero_quantity(self):
+        """Show the wizard to check for real-zero quantity."""
+        view = self.env.ref(
+            "stock_vertical_lift_empty_tray_check."
+            "vertical_lift_operation_pick_zero_check_view_form"
+        )
+        wizard_model = "vertical.lift.operation.pick.zero.check"
+        wizard = self.env[wizard_model].create(
+            {"vertical_lift_operation_pick_id": self.id}
+        )
+        return {
+            "name": _("Is the tray empty?"),
+            "type": "ir.actions.act_window",
+            "view_mode": "form",
+            "target": "new",
+            "views": [(view.id, "form")],
+            "view_id": view.id,
+            "res_model": wizard_model,
+            "res_id": wizard.id,
+            "context": self.env.context,
+        }

stock_vertical_lift_empty_tray_check/models/vertical_lift_operation_pick_zero_check.py

@@ -0,0 +1,87 @@
+# Copyright 2021 Camptocamp SA
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl)
+
+from odoo import _, fields, models
+
+
+class VerticalLiftOperationPickZeroCheck(models.TransientModel):
+    _name = "vertical.lift.operation.pick.zero.check"
+    _description = "Make sure the tray location is empty"
+
+    vertical_lift_operation_pick_id = fields.Many2one("vertical.lift.operation.pick")
+
+    def _get_data_from_operation(self):
+        """Return picking, location and product from the operation shuttle"""
+        operation = self.vertical_lift_operation_pick_id
+
+        # If the move is split into several move lines, it is
+        # moved to another picking, being a backorder of the
+        # original one. We are always interested in the original
+        # picking that was processed at first, so if the picking
+        # is a backorder of another picking, we take that other one.
+        picking = operation.picking_id.backorder_id or operation.picking_id
+        location = operation.current_move_line_id.location_id
+        product = operation.product_id
+        return operation, picking, location, product
+
+    def button_confirm_empty(self):
+        """User confirms the tray location is empty
+
+        This is in accordance with what we expected, because we only
+        call this action if we think the location is empty. We create
+        an inventory adjustment that states that a zero-check was
+        done for this location."""
+        operation, picking, location, product = self._get_data_from_operation()
+        inventory_name = _(f"Zero check in location: {location.complete_name}")
+        inventory = (
+            self.env["stock.inventory"]
+            .sudo()
+            .create(
+                {
+                    "name": inventory_name,
+                    "product_ids": [(4, product.id)],
+                    "location_ids": [(4, location.id)],
+                    "line_ids": [
+                        (
+                            0,
+                            0,
+                            {
+                                "product_id": product.id,
+                                "product_qty": 0,
+                                "theoretical_qty": 0,
+                                "location_id": location.id,
+                            },
+                        ),
+                    ],
+                }
+            )
+        )
+        inventory.action_start()
+        inventory.action_validate()
+
+        # Return to the execution of the release,
+        # but without checking again if the tray is empty.
+        return operation.with_context(skip_zero_quantity_check=True).button_release()
+
+    def button_confirm_not_empty(self):
+        """User confirms the tray location is not empty
+
+        This contradicts what we expected, because we only call this
+        action if we think the location is empty. We create a draft
+        inventory adjustment stating the mismatch.
+        """
+        operation, picking, location, product = self._get_data_from_operation()
+        inventory_name = _(
+            f"{picking.name} zero check issue on location {location.complete_name}"
+        )
+        self.env["stock.inventory"].sudo().create(
+            {
+                "name": inventory_name,
+                "product_ids": [(4, product.id)],
+                "location_ids": [(4, location.id)],
+            }
+        )
+
+        # Return to the execution of the release,
+        # but without checking again if the tray is empty.
+        return operation.with_context(skip_zero_quantity_check=True).button_release()

stock_vertical_lift_empty_tray_check/readme/CONFIGURE.rst

@@ -0,0 +1,4 @@
+General
+~~~~~~~
+
+In Inventory Settings, you must have activated the option: *Check Empty Tray*

stock_vertical_lift_empty_tray_check/readme/CONTRIBUTORS.rst

@@ -0,0 +1 @@
+* Carlos Serra-Toro <carlos.serra@camptocamp.com>

stock_vertical_lift_empty_tray_check/readme/DESCRIPTION.rst

@@ -0,0 +1,5 @@
+When a tray is released, and the system thinks it is empty,
+it prompts the user to actually check that it is empty or not.
+In any case, an inventory adjustment is done stating the
+situation: posted to zero if the tray is actually empty, and
+set to draft is it is not empty.

stock_vertical_lift_empty_tray_check/static/description/index.html

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+  border-left: solid 1px black;
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+
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+</head>
+<body>
+<div class="document" id="vertical-lift-empty-tray-check">
+<h1 class="title">Vertical Lift Empty Tray Check</h1>
+
+<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+!! This file is generated by oca-gen-addon-readme !!
+!! changes will be overwritten.                   !!
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
+<p><a class="reference external" href="https://odoo-community.org/page/development-status"><img alt="Alpha" src="https://img.shields.io/badge/maturity-Alpha-red.png" /></a> <a class="reference external" href="http://www.gnu.org/licenses/agpl-3.0-standalone.html"><img alt="License: AGPL-3" src="https://img.shields.io/badge/licence-AGPL--3-blue.png" /></a> <a class="reference external" href="https://github.com/OCA/stock-logistics-warehouse/tree/13.0/stock_vertical_lift_empty_tray_check"><img alt="OCA/stock-logistics-warehouse" src="https://img.shields.io/badge/github-OCA%2Fstock--logistics--warehouse-lightgray.png?logo=github" /></a> <a class="reference external" href="https://translation.odoo-community.org/projects/stock-logistics-warehouse-13-0/stock-logistics-warehouse-13-0-stock_vertical_lift_empty_tray_check"><img alt="Translate me on Weblate" src="https://img.shields.io/badge/weblate-Translate%20me-F47D42.png" /></a> <a class="reference external" href="https://runbot.odoo-community.org/runbot/153/13.0"><img alt="Try me on Runbot" src="https://img.shields.io/badge/runbot-Try%20me-875A7B.png" /></a></p>
+<p>When a tray is released, and the system thinks it is empty,
+it prompts the user to actually check that it is empty or not.
+In any case, an inventory adjustment is done stating the
+situation: posted to zero if the tray is actually empty, and
+set to draft is it is not empty.</p>
+<div class="admonition important">
+<p class="first admonition-title">Important</p>
+<p class="last">This is an alpha version, the data model and design can change at any time without warning.
+Only for development or testing purpose, do not use in production.
+<a class="reference external" href="https://odoo-community.org/page/development-status">More details on development status</a></p>
+</div>
+<p><strong>Table of contents</strong></p>
+<div class="contents local topic" id="contents">
+<ul class="simple">
+<li><a class="reference internal" href="#configuration" id="id1">Configuration</a><ul>
+<li><a class="reference internal" href="#general" id="id2">General</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#bug-tracker" id="id3">Bug Tracker</a></li>
+<li><a class="reference internal" href="#credits" id="id4">Credits</a><ul>
+<li><a class="reference internal" href="#authors" id="id5">Authors</a></li>
+<li><a class="reference internal" href="#contributors" id="id6">Contributors</a></li>
+<li><a class="reference internal" href="#maintainers" id="id7">Maintainers</a></li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="section" id="configuration">
+<h1><a class="toc-backref" href="#id1">Configuration</a></h1>
+<div class="section" id="general">
+<h2><a class="toc-backref" href="#id2">General</a></h2>
+<p>In Inventory Settings, you must have activated the option: <em>Check Empty Tray</em></p>
+</div>
+</div>
+<div class="section" id="bug-tracker">
+<h1><a class="toc-backref" href="#id3">Bug Tracker</a></h1>
+<p>Bugs are tracked on <a class="reference external" href="https://github.com/OCA/stock-logistics-warehouse/issues">GitHub Issues</a>.
+In case of trouble, please check there if your issue has already been reported.
+If you spotted it first, help us smashing it by providing a detailed and welcomed
+<a class="reference external" href="https://github.com/OCA/stock-logistics-warehouse/issues/new?body=module:%20stock_vertical_lift_empty_tray_check%0Aversion:%2013.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**">feedback</a>.</p>
+<p>Do not contact contributors directly about support or help with technical issues.</p>
+</div>
+<div class="section" id="credits">
+<h1><a class="toc-backref" href="#id4">Credits</a></h1>
+<div class="section" id="authors">
+<h2><a class="toc-backref" href="#id5">Authors</a></h2>
+<ul class="simple">
+<li>Camptocamp</li>
+</ul>
+</div>
+<div class="section" id="contributors">
+<h2><a class="toc-backref" href="#id6">Contributors</a></h2>
+<ul class="simple">
+<li>Carlos Serra-Toro &lt;<a class="reference external" href="mailto:carlos.serra&#64;camptocamp.com">carlos.serra&#64;camptocamp.com</a>&gt;</li>
+</ul>
+</div>
+<div class="section" id="maintainers">
+<h2><a class="toc-backref" href="#id7">Maintainers</a></h2>
+<p>This module is maintained by the OCA.</p>
+<a class="reference external image-reference" href="https://odoo-community.org"><img alt="Odoo Community Association" src="https://odoo-community.org/logo.png" /></a>
+<p>OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.</p>
+<p>This module is part of the <a class="reference external" href="https://github.com/OCA/stock-logistics-warehouse/tree/13.0/stock_vertical_lift_empty_tray_check">OCA/stock-logistics-warehouse</a> project on GitHub.</p>
+<p>You are welcome to contribute. To learn how please visit <a class="reference external" href="https://odoo-community.org/page/Contribute">https://odoo-community.org/page/Contribute</a>.</p>
+</div>
+</div>
+</div>
+</body>
+</html>

stock_vertical_lift_empty_tray_check/tests/__init__.py

@@ -0,0 +1,3 @@
+# Copyright 2021 Camptocamp SA
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html)
+from . import test_pick

stock_vertical_lift_empty_tray_check/tests/test_pick.py

@@ -0,0 +1,84 @@
+# Copyright 2021 Camptocamp SA
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html)
+
+from odoo.addons.stock_vertical_lift.tests.common import VerticalLiftCase
+
+
+class TestPick(VerticalLiftCase):
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        cls.env = cls.env(context=dict(cls.env.context, tracking_disable=True))
+        cls.picking_out = cls.env.ref(
+            "stock_vertical_lift.stock_picking_out_demo_vertical_lift_1"
+        )
+        cls.env["ir.config_parameter"].sudo().set_param(
+            "vertical_lift_empty_tray_check", True
+        )
+
+    def _test_location_empty_common(self, operation, tray_is_empty):
+        """Common part for tests checking the tray location is empty
+
+        Returns the new inventory adjustment created."""
+        self.assertEqual(operation.state, "scan_destination")
+        move_line = operation.current_move_line_id
+        customers_location = self.env.ref("stock.stock_location_customers")
+        customers_location.barcode = "CUSTOMERS"
+        operation.on_barcode_scanned(customers_location.barcode)
+        self.assertEqual(move_line.location_dest_id, customers_location)
+        self.assertEqual(operation.state, "save")
+        operation.button_save()
+        self.assertEqual(operation.state, "release")
+        self.assertEqual(operation.tray_qty, 0)
+
+        old_inventories = self.env["stock.inventory"].search([])
+
+        res_dict = operation.button_release()
+        wizard = self.env[(res_dict.get("res_model"))].browse(res_dict.get("res_id"))
+        wizard = wizard.with_context(
+            active_id=operation.id, active_model=operation._name
+        )
+        if tray_is_empty:
+            wizard.button_confirm_empty()
+        else:
+            wizard.button_confirm_not_empty()
+
+        new_inventory = self.env["stock.inventory"].search([]) - old_inventories
+        return new_inventory
+
+    def test_location_empty_is_empty(self):
+        """ Location is indicated as being empty, and it is"""
+        operation = self._open_screen("pick")
+        tray_location = operation.tray_location_id
+        tray_product = operation.current_move_line_id.product_id
+        inventory = self._test_location_empty_common(operation, tray_is_empty=True)
+
+        self.assertEqual(len(inventory), 1)
+        self.assertEqual(inventory.state, "done")
+        self.assertEqual(
+            inventory.name,
+            "Zero check in location: {}".format(tray_location.complete_name),
+        )
+        self.assertEqual(len(inventory.line_ids), 1)
+        self.assertEqual(inventory.line_ids[0].product_id, tray_product)
+        self.assertEqual(inventory.line_ids[0].location_id, tray_location)
+        self.assertEqual(inventory.line_ids[0].product_qty, 0)
+        self.assertEqual(inventory.line_ids[0].theoretical_qty, 0)
+
+    def test_location_empty_is_not_empty(self):
+        """ Location is indicated as being empty, but it is not.
+        """
+        operation = self._open_screen("pick")
+        tray_location = operation.tray_location_id
+        tray_product = operation.current_move_line_id.product_id
+        inventory = self._test_location_empty_common(operation, tray_is_empty=False)
+        self.assertEqual(len(inventory), 1)
+        self.assertEqual(inventory.state, "draft")
+        self.assertEqual(
+            inventory.name,
+            "{} zero check issue on location {}".format(
+                self.picking_out.name, tray_location.complete_name,
+            ),
+        )
+        self.assertEqual(inventory.product_ids, tray_product)
+        self.assertEqual(inventory.location_ids, tray_location)

stock_vertical_lift_empty_tray_check/views/res_config_setting_views.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<odoo>
+    <data>
+        <record id="res_config_settings_view_form" model="ir.ui.view">
+            <field name="name">res.config.settings.view.form.inherit.stock</field>
+            <field name="model">res.config.settings</field>
+            <field name="priority" eval="30" />
+            <field name="inherit_id" ref="stock.res_config_settings_view_form" />
+            <field name="arch" type="xml">
+                <xpath
+                    expr="//field[@name='group_stock_adv_location']/ancestor::div[hasclass('o_setting_box')]"
+                    position="after"
+                >
+                    <div class="col-12 col-lg-6 o_setting_box">
+                        <div class="o_setting_left_pane">
+                            <field name="vertical_lift_empty_tray_check" />
+                        </div>
+                        <div class="o_setting_right_pane">
+                            <label for="vertical_lift_empty_tray_check" />
+                            <div class="text-muted">
+                                If checked and the system thinks the vertical tray is
+                                empty, the operator will be asked to explicitly check
+                                if this is the case or not
+                            </div>
+                        </div>
+                    </div>
+                </xpath>
+            </field>
+        </record>
+    </data>
+</odoo>

stock_vertical_lift_empty_tray_check/views/vertical_lift_operation_pick_zero_check_views.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!-- Copyright 2021 Camptocamp SA
+     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl) -->
+<odoo>
+    <record id="vertical_lift_operation_pick_zero_check_view_form" model="ir.ui.view">
+        <field name="name">vertical.lift.operation.pick.zero.check.view.form</field>
+        <field name="model">vertical.lift.operation.pick.zero.check</field>
+        <field name="arch" type="xml">
+            <form>
+                <div class="row">
+                    <div class="col-6">
+                        <button
+                            name="button_confirm_empty"
+                            string="Tray Empty"
+                            type="object"
+                            class="btn-success"
+                            style="padding: 1em; font-size: 2em; text-transform: uppercase;"
+                        />
+                    </div>
+                    <div class="col-6">
+                        <button
+                            name="button_confirm_not_empty"
+                            string="Tray Not Empty"
+                            type="object"
+                            class="btn-danger"
+                            style="padding: 1em; font-size: 2em; text-transform: uppercase;"
+                        />
+                    </div>
+                </div>
+                <footer />
+            </form>
+        </field>
+    </record>
+</odoo>