Add discount value in move out for the sale line

__init__.py

@@ -1,4 +1,5 @@
 #This file is part of Tryton. The COPYRIGHT file at the top level of
 #this repository contains the full copyright notices and license terms.
 
+from move import *
 from sale import *

__tryton__.py

@@ -27,10 +27,11 @@
 ''',
     'depends': [
         'sale',
-        'account_invoice_discount'
+        'account_invoice_discount',
         ],
     'xml': [
-        'sale.xml'
+        'move.xml',
+        'sale.xml',
         ],
     'translation': [
         'locale/ca_ES.po',

move.py

@@ -0,0 +1,19 @@
+#This file is part of Tryton.  The COPYRIGHT file at the top level of
+#this repository contains the full copyright notices and license terms.
+
+from decimal import Decimal
+from trytond.model import ModelView, ModelSQL, fields
+from trytond.pyson import Not, Equal, Eval
+from trytond.transaction import Transaction
+from trytond.pool import Pool
+
+class Move(ModelSQL, ModelView):
+    _name = 'stock.move'
+
+    discount = fields.Numeric('Discount %', digits=(16, 4),
+        states={
+            'readonly': Not(Equal(Eval('state'), 'draft')),
+            },
+        depends=['state'])
+
+Move()

move.xml

@@ -0,0 +1,24 @@
+<?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. -->
+<tryton>
+    <data>
+        <record model="ir.ui.view" id="move_view_form">
+            <field name="model">stock.move</field>
+            <field name="inherit" ref="stock.move_view_form"/>
+            <field name="arch" type="xml">
+                <![CDATA[
+                <data>
+                    <xpath
+                        expr="/form/label[@name=&quot;unit_price&quot;]"
+                        position="before">
+                        <newline/>
+                        <label name="discount"/>
+                        <field name="discount"/>
+                    </xpath>
+                </data>
+                ]]>
+            </field>
+        </record>
+    </data>
+</tryton>

sale.py

@@ -57,6 +57,15 @@ class SaleLine(ModelSQL, ModelView):
         res[0]['discount'] = line.discount
         return [res[0]]
 
+    def get_move(self, line, shipment_type):
+        '''
+        Add discount value in move out for the sale line
+        '''
+        res = super(SaleLine, self).get_move(line, shipment_type)
+        if line.discount and shipment_type == 'out':
+            res['discount'] = line.discount
+        return res
+
 SaleLine()
 
 class Sale(ModelSQL, ModelView):