[ADD] sale_zero_stock_blockage: don't allow sales without approval

sale_zero_stock_blockage/__init__.py

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+from . import models

sale_zero_stock_blockage/__manifest__.py

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+{
+    "name": "Sale Zero Stock Blockage",
+    "application": False,
+    "installable": True,
+    "author": "sngoh",
+    "depends": ["sale"],
+    "auto_install": True,
+    "license": "LGPL-3",
+    "data": [
+        "views/sale_order_views.xml",
+    ],
+}

sale_zero_stock_blockage/models/__init__.py

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+from . import sale_order

sale_zero_stock_blockage/models/sale_order.py

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+from odoo import api, fields, models
+from odoo.exceptions import UserError
+
+
+class SaleOrder(models.Model):
+    _inherit = "sale.order"
+
+    zero_stock_approval = fields.Boolean(string="Zero Stock Approval")
+    has_user_access = fields.Boolean(compute="_compute_has_user_access")
+
+    @api.depends_context("uid")
+    def _compute_has_user_access(self):
+        has_access = self.env.user._is_admin()
+        for record in self:
+            record.has_user_access = not has_access
+
+    def action_confirm(self):
+        for order in self:
+            if not order.zero_stock_approval:
+                raise UserError("Please confirm the zero stock approval")
+
+        return super().action_confirm()

sale_zero_stock_blockage/views/sale_order_views.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+
+    <record id="view_order_form_view_zero_stock_blockage" model="ir.ui.view">
+        <field name="name">sale.order.form.inherit.sale.zero.stock.blockage</field>
+        <field name="model">sale.order</field>
+        <field name="inherit_id" ref="sale.view_order_form" />
+        <field name="arch" type="xml">
+            <xpath expr="//group[@name='order_details'] //field[@name='payment_term_id']"
+                position="after">
+                <field name="zero_stock_approval" string="Approval" readonly="has_user_access" />
+            </xpath>
+        </field>
+    </record>
+
+</odoo>