odoo/addons/purchase_double_validation/purchase_double_validation_installer.xml

<openerp>
    <data>
        <!-- configartion view -->

        <!-- record id="view_config_purchase_limit_amount" model="ir.ui.view">
            <field name="name">Configure Limit Amount for Purchase</field>
            <field name="model">purchase.double.validation.installer</field>
            <field name="type">form</field>
            <field name="inherit_id" ref="base.res_config_view_base"/>
            <field name="arch" type="xml">
              <data>
                <form position="attributes">
                  <attribute name="string">Purchase Application Configuration</attribute>
                </form>
                <separator string="title" position="attributes">
                <attribute name="string">Configure Limit Amount for Purchase</attribute>
                  </separator>
                  <xpath expr="//label[@string='description']" position="attributes">
                    <attribute name="string">Define minimum amount after which puchase is needed to be validated.</attribute>
                  </xpath>
                <xpath expr="//separator[@string=&quot;vsep&quot;]" position="attributes">
                      <attribute name="rowspan">15</attribute>
                      <attribute name="string"/>
                  </xpath>
                <group string="res_config_contents" position="replace">
                  <field name="limit_amount"/>
                  <newline/>
                </group>
              </data>
            </field>
        </record>

        <record id="action_config_purchase_limit_amount" model="ir.actions.act_window">
            <field name="name">Configure Limit Amount for Purchase</field>
            <field name="type">ir.actions.act_window</field>
            <field name="res_model">purchase.double.validation.installer</field>
            <field name="view_id" ref="view_config_purchase_limit_amount"/>
            <field name="view_type">form</field>
            <field name="view_mode">form</field>
            <field name="target">new</field>
        </record-->

        <!-- register configuration wizard -->
        <!--record id="config_wizard_step_purchase_limit_amount" model="ir.actions.todo">
            <field name="action_id" ref="action_config_purchase_limit_amount"/>
            <field name="category_id" ref="purchase.category_purchase_config"/>
            <field name="type">once</field>
        </record-->

        <record id="view_double_purchase_config" model="ir.ui.view">
            <field name="name">Purchase Application</field>
            <field name="model">res.config.settings</field>
            <field name="type">form</field>
            <field name="inherit_id" ref="purchase.view_purchase_config"/>
            <field name="arch" type="xml">
                <field name="module_purchase_double_validation" position="after">
                    <field name="limit_amount" nolabel="1"/>
                </field>
            </field>
        </record>

    </data>
</openerp>