[FIX] delivery: add method to check if commercial invoice is needed

This is a side fix to add a helper method in delivery. The main fix is
here: https://github.com/odoo/enterprise/pull/34907

Also included the change when localization is IN, as when the ship_from
country is IN, the commercial invoice information is mandatory.
Reference is here: https://github.com/odoo/odoo/pull/82084 and https://github.com/odoo/odoo/pull/84159



opw-3031665

closes odoo/odoo#108490

X-original-commit: a72623c1
Related: odoo/enterprise#35167
Signed-off-by: Tiffany Chang <tic@odoo.com>

addons/delivery/models/stock_picking.py

@@ -280,6 +280,10 @@ class StockPicking(models.Model):
             weight += move.product_qty * move.product_id.weight
         return weight
 
+    def _should_generate_commercial_invoice(self):
+        self.ensure_one()
+        return self.picking_type_id.warehouse_id.partner_id.country_id != self.partner_id.country_id
+
 
 class StockReturnPicking(models.TransientModel):
     _inherit = 'stock.return.picking'

addons/l10n_in_stock/__init__.py

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

addons/l10n_in_stock/models/__init__.py

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

addons/l10n_in_stock/models/stock_picking.py

+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import models
+
+
+class StockPicking(models.Model):
+    _inherit = 'stock.picking'
+
+    def _should_generate_commercial_invoice(self):
+        super(StockPicking, self)._should_generate_commercial_invoice()
+        return True