[ADD] project_purchase: Monitoring purchase in project

Show purchase information in project when both use the same analytic
account.

Task-2469742
PR #68708

addons/project_purchase/__init__.py

+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+from . import models

addons/project_purchase/__manifest__.py

+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+{
+    'name': "Project Purchase",
+    'version': '1.0',
+    'summary': "Monitor purchase in project",
+    'description': "",
+    'category': 'Services/Project',
+    'depends': ['purchase', 'project'],
+    'data': [
+        'views/project_views.xml',
+    ],
+    'application': False,
+    'auto_install': True,
+    'license': 'LGPL-3',
+}

addons/project_purchase/models/__init__.py

+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+from . import project

addons/project_purchase/models/project.py

+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import fields, models
+
+
+class Project(models.Model):
+    _inherit = "project.project"
+
+    purchase_order_count = fields.Integer(related="analytic_account_id.purchase_order_count")
+
+    def action_view_purchase_orders(self):
+        self.ensure_one()
+        return self.analytic_account_id.action_view_purchase_orders()

addons/project_purchase/views/project_views.xml

+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="project_project_form_view_inherited" model="ir.ui.view">
+        <field name="name">project.project.view.inherited</field>
+        <field name="model">project.project</field>
+        <field name="inherit_id" ref="project.edit_project" />
+        <field name="priority">20</field>
+        <field name="arch" type="xml">
+            <xpath expr="//button[@name='action_view_analytic_account_entries']" position="after">
+                <button class="oe_stat_button" type="object" name="action_view_purchase_orders"
+                    icon="fa-shopping-cart" attrs="{'invisible': [('purchase_order_count', '=', 0)]}">
+                    <field string="Purchase Orders" name="purchase_order_count" widget="statinfo"/>
+                </button>
+            </xpath>
+        </field>
+    </record>
+</odoo>