[IMP] set invoice_date required on account.invoice, by view

grap_change_views/__openerp__.py

@@ -99,6 +99,7 @@
         'views/view_sale_order.xml',
         'views/view_stock_inventory.xml',
         'views/view_stock_inventory_line.xml',
+        'views/view_stock_invoice_onshipping.xml',
         'views/view_stock_location.xml',
         'views/view_stock_move.xml',
         'views/view_stock_picking.xml',

grap_change_views/views/view_account_invoice.xml

@@ -32,6 +32,9 @@ License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
             <field name="account_id" position="attributes">
               <attribute name="groups">account.group_account_manager</attribute>
             </field>
+            <field name="date_invoice" position="attributes">
+              <attribute name="required">1</attribute>
+            </field>
             <xpath expr="//field[@name='invoice_line']/tree/field[@name='account_id']" position="attributes">
                 <attribute name="groups">account.group_account_manager</attribute>
              </xpath>

grap_change_views/views/view_stock_invoice_onshipping.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+Copyright (C) 2013-Today GRAP (http://www.grap.coop)
+@author: Sylvain LE GAL (https://twitter.com/legalsylvain)
+License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+-->
+
+<openerp><data>
+
+    <record id="view_stock_invoice_onshipping_form" model="ir.ui.view">
+        <field name="model">stock.invoice.onshipping</field>
+        <field name="inherit_id" ref="stock_account.view_stock_invoice_onshipping"/>
+        <field name="arch" type="xml">
+            <field name="invoice_date" position="attributes">
+                <attribute name="required">1</attribute>
+            </field>
+        </field>
+    </record>
+
+</data></openerp>