Add agent

__init__.py

@@ -3,6 +3,7 @@
 from trytond.pool import Pool
 from . import sale
 from . import dash
+from . import party
 
 
 def register():
@@ -11,4 +12,5 @@ def register():
         sale.AppDelivery,
         sale.AppSaleOrder,
         dash.DashApp,
+        party.Party,
         module='dash_sale', type_='model')

party.py

@@ -0,0 +1,9 @@
+# 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 trytond.model import fields
+from trytond.pool import PoolMeta
+
+
+class Party(metaclass=PoolMeta):
+    __name__ = 'party.party'
+    agent = fields.Many2One('commission.agent', 'Agent')

party.xml

@@ -0,0 +1,12 @@
+<?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="party_view_form">
+            <field name="model">party.party</field>
+            <field name="inherit" ref="party.party_view_form"/>
+            <field name="name">party_form</field>
+        </record>
+    </data>
+</tryton>

tryton.cfg

@@ -11,3 +11,4 @@ depends:
     dash
 xml:
     sale.xml
+    party.xml

view/party_form.xml

@@ -0,0 +1,18 @@
+<?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. -->
+<data>
+    <xpath
+        expr="/form/notebook/page[@id='sale']/field[@name='sale_price_list']"
+        position="after">
+        <label name="zone"/>
+        <field name="zone"/>
+    </xpath>
+
+    <xpath
+        expr="/form/notebook/page[@id='sale']/field[@name='sale_price_list']"
+        position="after">
+        <label name="agent"/>
+        <field name="agent"/>
+    </xpath>
+</data>