diff --git a/addons/purchase/models/product.py b/addons/purchase/models/product.py
index bb5817086c9..ddd3c558950 100644
--- a/addons/purchase/models/product.py
+++ b/addons/purchase/models/product.py
@@ -22,7 +22,7 @@ class ProductTemplate(models.Model):
         ('receive', 'On received quantities'),
     ], string="Control Policy", help="On ordered quantities: Control bills based on ordered quantities.\n"
         "On received quantities: Control bills based on received quantities.", default="receive")
-    purchase_line_warn = fields.Selection(WARNING_MESSAGE, 'Purchase Order Line', help=WARNING_HELP, required=True, default="no-message")
+    purchase_line_warn = fields.Selection(WARNING_MESSAGE, 'Purchase Order Line Warning', help=WARNING_HELP, required=True, default="no-message")
     purchase_line_warn_msg = fields.Text('Message for Purchase Order Line')
 
     def _compute_purchased_product_qty(self):
diff --git a/addons/purchase_stock/models/product.py b/addons/purchase_stock/models/product.py
index f09db2e1167..66bfb199b3a 100644
--- a/addons/purchase_stock/models/product.py
+++ b/addons/purchase_stock/models/product.py
@@ -23,6 +23,8 @@ class ProductProduct(models.Model):
     _name = 'product.product'
     _inherit = 'product.product'
 
+    purchase_order_line_ids = fields.One2many('purchase.order.line', 'product_id', help='Technical: used to compute quantities.')
+
     def _get_quantity_in_progress(self, location_ids=False, warehouse_ids=False):
         if not location_ids:
             location_ids = []
diff --git a/addons/purchase_stock/models/stock.py b/addons/purchase_stock/models/stock.py
index 89e46abbe1f..4e690217e23 100644
--- a/addons/purchase_stock/models/stock.py
+++ b/addons/purchase_stock/models/stock.py
@@ -183,6 +183,11 @@ class Orderpoint(models.Model):
         'product.supplierinfo', string='Vendor', check_company=True,
         domain="['|', ('product_id', '=', product_id), '&', ('product_id', '=', False), ('product_tmpl_id', '=', product_tmpl_id)]")
 
+    @api.depends('product_id.purchase_order_line_ids', 'product_id.purchase_order_line_ids.state')
+    def _compute_qty(self):
+        """ Extend to add more depends values """
+        return super()._compute_qty()
+
     @api.depends('route_id')
     def _compute_show_suppplier(self):
         buy_route = []