[ADD] zero stock blockage: added zero stock block approval functionality

zero_stock_blockage/__init__.py

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+from . import models

zero_stock_blockage/__manifest__.py

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+{
+    "name": "ZERO STOCK BLOCKAGE",
+    "version": "1.0",
+    "summary": "Restrict Sales Order Confirmation if stock is zero",
+    "description": "Adds approval mechanism for sales orders with zero stock.",
+    "category": "Sales",
+    "application": True,
+    "depends": ["base", "sale"],
+    "data": [
+        "views/zero_stock_blockage_views.xml",
+    ],
+    "license": "LGPL-3",
+    "installable": True,
+}

zero_stock_blockage/models/__init__.py

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+from . import sale_order

zero_stock_blockage/models/sale_order.py

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+from odoo import fields, models, api
+from odoo.exceptions import UserError
+
+
+class SaleOrder(models.Model):
+    _inherit = "sale.order"
+
+    zero_stock_approval = fields.Boolean(string="Approval", default="false")
+
+    def action_confirm(self):
+        result = super().action_confirm()
+        for order in self:
+            if not order.zero_stock_approval:
+                raise UserError(
+                    "This sale order cannot be confirmed without zero stock approval"
+                )
+        return result
+
+    @api.model
+    def fields_get(self, allfields=None, attributes=None):
+        res = super().fields_get(allfields, attributes)
+        if not self.env.user.has_group("sales_team.group_sale_manager"):
+            if "zero_stock_approval" in res:
+                res["zero_stock_approval"]["readonly"] = True
+        return res

zero_stock_blockage/views/zero_stock_blockage_views.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+    <record id="view_order_form_inherit_zero_stock" model="ir.ui.view">
+        <field name="name">sale.order.form.zero.stock</field>
+        <field name="model">sale.order</field>
+        <field name="inherit_id" ref="sale.view_order_form" />
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='payment_term_id']" position="after">
+                <field name="zero_stock_approval"
+                />
+            </xpath>
+        </field>
+    </record>
+</odoo>