add field code

__init__.py

@@ -13,6 +13,7 @@ from . import product
 from . import sale
 from . import invoice_authorization
 from . import asset
+from . import payment_term
 
 
 def register():
@@ -70,6 +71,7 @@ def register():
         invoice.InvoiceUpdateStart,
         sale.SaleUpdateStart,
         purchase.PurchaseUpdateStart,
+        payment_term.PaymentTerm,
         module='account_col', type_='model')
     Pool.register(
         move.AccountMoveSheet,

payment_term.py

@@ -0,0 +1,10 @@
+# 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.pool import PoolMeta
+from trytond.model import fields
+
+
+class PaymentTerm(metaclass=PoolMeta):
+    'Payment Term'
+    __name__ = 'account.invoice.payment_term'
+    code = fields.Char('Code')

payment_term.xml

@@ -0,0 +1,17 @@
+<?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="payment_term_view_form">
+            <field name="model">account.invoice.payment_term</field>
+            <field name="inherit" ref='account_invoice.payment_term_view_form'/>
+            <field name="name">payment_term_form</field>
+        </record>
+        <record model="ir.ui.view" id="payment_term_view_tree">
+            <field name="model">account.invoice.payment_term</field>
+            <field name="inherit" ref='account_invoice.payment_term_view_tree'/>
+            <field name="name">payment_term_tree</field>
+        </record>
+    </data>
+</tryton>

tryton.cfg

@@ -26,3 +26,4 @@ xml:
     product.xml
     invoice_authorization.xml
     sale.xml
+    payment_term.xml

view/payment_term_form.xml

@@ -0,0 +1,9 @@
+<?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/field[@name='name']" position="after">
+      <label name="code"/>
+      <field name="code"/>
+  </xpath>
+</data>

view/payment_term_tree.xml

@@ -0,0 +1,10 @@
+<?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="/tree/field[@name='name']"
+        position="after">
+            <field name="code"/>
+    </xpath>
+</data>