[IMP] project_purchase: allow user to add new purchase order

Before this commit, when the user is in the project update kanban view
and click on Purchase Order row shown in Project Profitability section
in the right side panel, the user cannot create or edit a purchase order
because the AA on each purchase order line is used to link those
purchase orders to the project.

This commit adds the project and also `project_update` key in the
context to use them keys to set the AA on new Purchase Order Line by
default.

task-2861207

closes odoo/odoo#95721

Related: odoo/enterprise#29304
Signed-off-by: Laurent Stukkens (ltu) <ltu@odoo.com>

addons/project_purchase/models/__init__.py

@@ -1,3 +1,4 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 from . import project
+from . import purchase_order_line

addons/project_purchase/models/project.py

@@ -40,7 +40,7 @@ class Project(models.Model):
             'views': [[False, 'tree'], [False, 'form']],
             'domain': [('id', 'in', purchase_orders.ids)],
             'context': {
-                'create': False,
+                'project_id': self.id,
             }
         }
         if len(purchase_orders) == 1:

addons/project_purchase/models/purchase_order_line.py

@@ -0,0 +1,15 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import fields, models
+
+
+class PurchaseOrderLine(models.Model):
+    _inherit = 'purchase.order.line'
+
+    def _default_account_analytic_id(self):
+        if self._context.get('project_id'):
+            return self.env['project.project'].browse(self._context['project_id']).analytic_account_id
+        return False
+
+    account_analytic_id = fields.Many2one(default=_default_account_analytic_id)