diff --git a/addons/purchase/models/purchase.py b/addons/purchase/models/purchase.py
index ca7aabe19c2..bfd27051a54 100644
--- a/addons/purchase/models/purchase.py
+++ b/addons/purchase/models/purchase.py
@@ -319,8 +319,8 @@ class PurchaseOrder(models.Model):
     def button_approve(self, force=False):
         self.write({'state': 'purchase', 'date_approve': fields.Date.context_today(self)})
         self._create_picking()
-        if self.company_id.po_lock == 'lock':
-            self.write({'state': 'done'})
+        self.filtered(
+            lambda p: p.company_id.po_lock == 'lock').write({'state': 'done'})
         return {}
 
     @api.multi
diff --git a/doc/cla/corporate/wink.md b/doc/cla/corporate/wink.md
new file mode 100644
index 00000000000..59b22c1b64b
--- /dev/null
+++ b/doc/cla/corporate/wink.md
@@ -0,0 +1,15 @@
+Belgium, 2018-04-06
+
+WINK SA/NV agrees to the terms of the Odoo Corporate Contributor License
+Agreement v1.0.
+
+I declare that I am authorized and able to make this agreement and sign this
+declaration.
+
+Signed,
+
+Thomas Fossoul tfossoul@wink.be https://github.com/tfossoulw
+
+List of contributors:
+
+Thomas Fossoul tfossoul@wink.be https://github.com/tfossoulw