diff --git a/sf_manufacturing/models/purchase_order.py b/sf_manufacturing/models/purchase_order.py
index b7ec1bc2..a16eb120 100644
--- a/sf_manufacturing/models/purchase_order.py
+++ b/sf_manufacturing/models/purchase_order.py
@@ -124,7 +124,7 @@ class PurchaseOrderLine(models.Model):
                 if match:
                     product_name = match.group(0)
                 sale_order_name = ''
-                match_sale = re.search(r'(\d+)', record.product_id.name)
+                match_sale = re.search(r'S(\d+)', record.product_id.name)
                 if match_sale:
                     sale_order_name = match_sale.group(0)
                 sale_order = self.env['sale.order'].sudo().search(