Waht do you mean with "object" ?

Already tried o.default_isEnabled and it really doesn't work.

I read this : http://www.mindissoftware.com/2014/10/17/How-to-save-and-load-module-configuration-in-odoo/

Is it because I use default_isEnabled to name my variable ? Not stored in the database as standard field ?

See below the full code for a better understanding (I made some minor changes):

__openerp__.py

{

        'name': 'My Module',

        'description': 'Test my module ',

        'author': 'Theudric',

        'depends' : ['base', 'report'],

        'application': True,

        'data': ['myModule_view.xml', 'header.xml'],

}

__init__.py

from . import myModule

myModule.py

# -*- coding: utf-8 -*-

from openerp import models, fields, api

        class myconfig(models.TransientModel):

                _name = 'mymodule.myconfig'

                _inherit = 'res.config.settings'

                default_isEnabled = fields.Boolean(

                        'Enable my module',

                        default=True,

                        default_model='mymodule.myconfig',

                )

myModule_view.xml

<?xml version="1.0" encoding="utf-8"?>

<openerp>

        <data>

                <record id="view_custom_config_settings" model="ir.ui.view">

                        <field name="name">custom settings</field>

                        <field name="model">mymodule.myconfig</field>

                        <field name="arch" type="xml">

                                <form string="Configure Accounting" version="7.0" class="oe_form_configuration">

                                        <header>

                                                <button string="Apply" type="object" name="execute" class="oe_highlight"/>

                                                or

                                                <button string="Cancel" type="object" name="cancel" class="oe_link"/>

                                        </header>

                                        <field name="default_isEnabled"/>

                                </form>

                        </field>

                 </record>

                 <record id="action_custom_config" model="ir.actions.act_window">

                        <field name="name">Custom Settings</field>

                         <field name="type">ir.actions.act_window</field>

                         <field name="res_model">mymodule.myconfig</field>

                         <field name="view_mode">form</field>

                         <field name="target">inline</field>

                 </record>

                 <menuitem id="menu_custom_config" name="Custom Settings" parent="base.menu_config"

                 sequence="16" action="action_custom_config"/>

         </data>

</openerp>

header.xml

<?xml version="1.0"?>
<openerp>

        <data>

                 <template id="mymodule_header" inherit_id="report.external_layout_header" >

                         <xpath expr="//div[@class='header']" position="inside">

                                 <div t-if="company.logo">Hello it is working with company.logo</div>

                                 <!--div t-if="res.config.settings.default_isEnabled">1 Not working !!!</div-->

                                 <!--div t-if="config.settings.default_isEnabled">2 Not working !!!</div-->

                                 <!--div t-if="settings.default_isEnabled">3 Not working !!!</div-->

                                 <div t-if="default_isEnabled">4 Not working !!!</div>

                                 <!--div t-if="o.res.config.settings.default_isEnabled">5 Not working !!!</div-->

                                 <!--div t-if="o.config.settings.default_isEnabled">6 Not working !!!</div-->

                                 <!--div t-if="o.settings.default_isEnabled">7 Not working !!!</div-->

                                 <!--div t-if="o.default_isEnabled">8 Not working !!!</div-->

                                 <!--div t-if="mymodule.myconfig.default_isEnabled">9 Not working !!!</div-->

                                 <!--div t-if="myconfig.default_isEnabled">10 Not working !!!</div-->

                         </xpath>

                 </template>

         </data>

</openerp>

And now, when I print one invoice, I have no access to my variable default_isEnabled

The goal is to display one image in the invoice header if my variable is enabled. But for now let's write some text instead an image.

All commented <div> just above generated errors. Text "4 Not working !!!" is never displayed : default_isEnabled=True or False

Hope this is more clear now.