Add missing purchase field to purchase_line_tree_sequence

issue5047
review21481002

view/purchase_line_tree_sequence.xml

@@ -2,6 +2,7 @@
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
 <tree string="Lines" sequence="sequence">
+    <field name="purchase"/>
     <field name="type"/>
     <field name="product"/>
     <field name="description"/>