[FIX] sale_project: Display SO with services only

Purpose
=======

On the project form view, only propose SO with the related customer
+ SO on which there is at least one line with a service product.

1 files changed, 3 insertions, 1 deletions

diff --git a/addons/sale_project/models/project.py b/addons/sale_project/models/project.py
index b2895679d75..adcddc144c6 100644
--- a/addons/sale_project/models/project.py
+++ b/addons/sale_project/models/project.py
@@ -15,7 +15,9 @@ class Project(models.Model):
         domain="[('is_service', '=', True), ('is_expense', '=', False), ('order_id', '=', sale_order_id), ('state', 'in', ['sale', 'done']), '|', ('company_id', '=', False), ('company_id', '=', company_id)]",
         help="Sales order item to which the project is linked. Link the timesheet entry to the sales order item defined on the project. "
         "Only applies on tasks without sale order item defined, and if the employee is not in the 'Employee/Sales Order Item Mapping' of the project.")
-    sale_order_id = fields.Many2one('sale.order', 'Sales Order', domain="[('partner_id', '=', partner_id)]", copy=False, help="Sales order to which the project is linked.")
+    sale_order_id = fields.Many2one('sale.order', 'Sales Order',
+        domain="[('order_line.product_id.type', '=', 'service'), ('partner_id', '=', partner_id)]",
+        copy=False, help="Sales order to which the project is linked.")
 
     _sql_constraints = [
         ('sale_order_required_if_sale_line', "CHECK((sale_line_id IS NOT NULL AND sale_order_id IS NOT NULL) OR (sale_line_id IS NULL))", 'The project should be linked to a sale order to select a sale order item.'),