Adding exception state on the purchase requests

issue5107
review16811002

view/handle_purchase_cancellation_start_form.xml

@@ -0,0 +1,8 @@
+<?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 string="Handle Purchase Cancellation">
+    <image name="tryton-dialog-information" xexpand="0" xfill="0"/>
+    <label string="Do you want to cancel the request or to reset it to draft?" 
+        id="question" yalign="0.0" xalign="0.0" xexpand="1"/>
+</form>

view/purchase_request_form.xml

@@ -34,4 +34,9 @@ this repository contains the full copyright notices and license terms. -->
     <field name="origin"/>
     <label name="state"/>
     <field name="state"/>
+    <group col="1" colspan="2" id="buttons">
+        <button name="handle_purchase_cancellation_exception"
+            string="Handle Purchase Cancellation"
+            icon="tryton-go-next"/>
+    </group>
 </form>