diff --git a/modules/stock_supply/purchase_request.py b/modules/stock_supply/purchase_request.py
index 85265f54ed..b213a33621 100644
--- a/modules/stock_supply/purchase_request.py
+++ b/modules/stock_supply/purchase_request.py
@@ -135,6 +135,7 @@ class PurchaseRequest(metaclass=PoolMeta):
         products = set(products)
         reqs = cls.search([
                 ('state', '=', 'draft'),
+                ('purchase_line', '=', None),
                 ('company', '=', company.id),
                 ('origin', 'like', 'stock.order_point,%'),
                 ])