Add module service_line_qty_update_sale

service_line_qty_update_sale/models/__init__.py

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+from . import sale_order

service_line_qty_update_sale/models/sale_order.py

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+# Copyright 2020 Akretion France (http://www.akretion.com)
+# @author Alexis de Lattre <alexis.delattre@akretion.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import api, fields, models
+
+
+class SaleOrder(models.Model):
+    _inherit = 'sale.order'
+
+    has_service = fields.Boolean(compute='_compute_has_service')
+
+    @api.depends('order_line.product_id.type')
+    def _compute_has_service(self):
+        for order in self:
+            has_service = False
+            for l in order.order_line:
+                if l.product_id.type == 'service':
+                    has_service = True
+                    break
+            order.has_service = has_service