Hi Stefan The working copy is below,, just copy and see if it works for let me know if you need any help it will create a menu like dev under that you add same dhl label and in warehouse delivery orders it is accessible while creating and editing .

Thanks

Py File

import logging
from osv import fields,osv
_logger = logging.getLogger(__name__)

class dhl_label(osv.osv):
    _name = 'dhl.label'

    _columns = {
        'name': fields.char('dhl Label', size=32),
        'stock_picking_out': fields.many2many('stock.picking.out', 'dhl_label_stock_picking_out_rel', 'dhl_label_id',
                                              'stock_picking_out_id','Stocking Picking Out'),

    }

#dev_person()

class stock_picking_out(osv.osv):
    _inherit = 'stock.picking.out'

    _columns = {
        'dhl_label': fields.many2many('dhl.label', 'dhl_label_stock_picking_out_rel', 'stock_picking_out_id',
                                      'dhl_label_id','SPO Dhl Label'),

    }

View File

<?xml version="1.0"?>
<openerp>
<data>
    <record id="view_dhl_label_form" model="ir.ui.view">
            <field name="name">dhl.label.form</field>
            <field name="model">dhl.label</field>
            <field name="arch" type="xml">
                <field name="name"/>
                <form string="DHL Label" version="7.0">
                    <sheet>
                        <group>
                            <group>
                                <field name="stock_picking_out" widget="many2many_tags"/>
                            </group>
                        </group>
                    </sheet>
                </form>
            </field>
        </record>

    <record model="ir.ui.view" id="view_person_tree">
        <field name="name">dhl.label.tree</field>
        <field name="model">dhl.label</field>
        <field name="type">tree</field>
        <field name="arch" type="xml">
            <tree string="dev.person">
                <field name="name"/>
                <field name="stock_picking_out"/>
            </tree>
        </field>
    </record>

    <record model="ir.actions.act_window" id="action_dhl_label">
        <field name="name">dhl.label</field>
        <field name="res_model">dhl.label</field>
        <field name="view_type">form</field>
        <field name="view_mode">tree,form</field>
    </record>


<!--<menuitem id="menu_item_abi_notes" parent="menu_section_ramport" name="Abi Results" action="action_abi_results" />-->
<menuitem id="dev_menu" name="dev" />
 <menuitem id="menu_section_test" parent="dev_menu" name="Test" />
<menuitem id="menu_person" parent="menu_section_test" name="DHL Label" action="action_dhl_label" />
<!--<menuitem id="menu_prop" parent="dev_menu" name="prop" action="action_property" />-->

    <record id="nfx_dhl_view_picking_out_form" model="ir.ui.view">
            <field name="name">nfx.dhl.stock.picking.out.form</field>
            <field name="model">stock.picking.out</field>
            <field name="inherit_id" ref="stock.view_picking_out_form"/>
            <field name="arch" type="xml">
                <data>

                    <notebook position="inside">
                        <page string="DHL Label">
                            <field name="dhl_label" select="1"/>
                            <field name="origin" select="1"/>
                        </page>
                    </notebook>

                </data>
            </field>
        </record>

    <record model="ir.ui.view" id="view_property_tree">
        <field name="name">stock.picking.out</field>
        <field name="model">stock.picking.out</field>
        <field name="inherit_id" ref="stock.view_picking_out_tree"/>
        <field name="type">tree</field>
        <field name="arch" type="xml">
            <field name="name" position="after">
                <field name="dhl_label"/>
            </field>
        </field>
    </record>

    <record model="ir.actions.act_window" id="action_stock_picking_out_1">
        <field name="name">stock.picking.out</field>
        <field name="res_model">stock.picking.out</field>
        <field name="view_type">form</field>
        <field name="view_mode">tree,form</field>
    </record>
<menuitem id="menu_prop" parent="menu_section_test" name="Stock picking out" action="action_stock_picking_out_1" />

</data>

</openerp>