diff --git a/addons/sale_product_matrix/models/__init__.py b/addons/sale_product_matrix/models/__init__.py
index f2d32ff9c24..330596cf5ad 100644
--- a/addons/sale_product_matrix/models/__init__.py
+++ b/addons/sale_product_matrix/models/__init__.py
@@ -1,4 +1,5 @@
-# -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
-from . import sale_order
+
 from . import product_template
+from . import sale_order
+from . import sale_order_line
diff --git a/addons/sale_product_matrix/models/sale_order_line.py b/addons/sale_product_matrix/models/sale_order_line.py
new file mode 100644
index 00000000000..accfb4b6b4a
--- /dev/null
+++ b/addons/sale_product_matrix/models/sale_order_line.py
@@ -0,0 +1,9 @@
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import fields, models
+
+
+class SaleOrderLine(models.Model):
+    _inherit = 'sale.order.line'
+
+    product_add_mode = fields.Selection(related='product_template_id.product_add_mode', depends=['product_template_id'])