diff --git a/modules/purchase_trade/view/purchase_btb_form.xml b/modules/purchase_trade/view/purchase_btb_form.xml
index 02bf32d..9d2187d 100644
--- a/modules/purchase_trade/view/purchase_btb_form.xml
+++ b/modules/purchase_trade/view/purchase_btb_form.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
-<form col="8">
+<form col="4">
     <group col="4" colspan="4" id="hd" yfill="1">
         <label name="party"/>
         <field name="party"/>