python - Addition in General Settings of Odoo -

i writing custom odoo module, configuration can set user. want add setting in
settings -> configuration -> general settings

therefore, created .py containing:

from openerp.osv import fields, osv  class mymodule_configuration(osv.osv_memory):    _inherit = 'res.config.settings'    'test_field': fields.char(                        string='test field',                        required=true,                              ) 

.xml

<record id="custom_id" model="ir.ui.view">    <field name="name">general settings</field>    <field name="model">res.config.settings</field>    <field name="arch" type="xml">       <form string="general">          <field name="test_field"/>       </form>    </field> </record> 

it not change general settings.

if add reference id like:

<field name="inherit_id" ref="base_setup.view_general_configuration"/> 

then got error

parseerror: "validateerror field(s) arch failed against constraint: invalid view definition

error details: field module_portal not exist

can me sort out issue?

i followed steps , successful resolve issue.