allow change of tracking number even after confirmation of delivery

ext/custom-addons/tz_carrier_allow_tracking_modification/LICENSE

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+Odoo Proprietary License v1.0
+
+This software and associated files (the "Software") may only be used (executed,
+modified, executed after modifications) if you have purchased a valid license
+from the authors, typically via Odoo Apps, or if you have received a written
+agreement from the authors of the Software (see the COPYRIGHT file).
+
+You may develop Odoo modules that use the Software as a library (typically by
+depending on it, importing it and using its resources), but without copying any
+source code or material from the Software. You may distribute those modules
+under the license of your choice, provided that this license is compatible with
+the terms of the Odoo Proprietary License (For example: LGPL, MIT,
+or proprietary licenses similar to this one).
+
+It is forbidden to publish, distribute, sublicense, or sell copies of the Software
+or modified copies of the Software.
+
+The above copyright notice and this permission notice must be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

ext/custom-addons/tz_carrier_allow_tracking_modification/__init__.py

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+# -*- coding: utf-8 -*-
+
+from . import models

ext/custom-addons/tz_carrier_allow_tracking_modification/__manifest__.py

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+# Copyright 2018-Today TZAustria
+# License OPL-1 or later (https://www.odoo.com/documentation/user/11.0/legal/licenses/licenses.html#licenses).
+
+# noinspection PyStatementEffect
+{
+    'name': 'TZ Carrier Allow Tracking Modification',
+    'summary' : 'allows modification of tracking number even after confirmation of delivery',
+    'version': '11.0.1.0.0',
+    'license': 'OPL-1',
+    'author': 'TZAustria',
+    'support': 'andreas.osim@glaser-co.at',
+    'website': 'https://www.tzaustria.at',
+    'depends': ['sale_stock',],
+    'data': ['views/delivery_carrier_track.xml',],
+    'installable': True,
+    'auto_install': False,
+}

ext/custom-addons/tz_carrier_allow_tracking_modification/models/__init__.py

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+# -*- coding: utf-8 -*-
+
+from . import delivery_carrier_pack

ext/custom-addons/tz_carrier_allow_tracking_modification/models/delivery_carrier_pack.py

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+# Copyright 2018-Today Tischlerzentrum gmbh (<http://www.tzaustria.at>)
+# License OPL-1 or later (https://www.odoo.com/documentation/user/11.0/legal/licenses/licenses.html#licenses).
+
+from odoo import api, fields, models
+
+class DeliveryCarrierTrack(models.Model):
+    _inherit = 'stock.picking'
+
+    @api.multi
+    def write(self,vals):
+        #Check whether the carrier_tracking_ref field has being modified
+        if 'carrier_tracking_ref' in vals:
+            self.message_post('Tracking_number geändert auf: %s' % vals.get('carrier_tracking_ref'))
+
+        return super(DeliveryCarrierTrack, self).write(vals)

ext/custom-addons/tz_carrier_allow_tracking_modification/views/delivery_carrier_track.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2018-Today Tischlerzentrum gmbh(<http://www.tzaustria.at>)
+     License OPL-1 or later (https://www.odoo.com/documentation/user/11.0/legal/licenses/licenses.html#licenses). -->
+
+<odoo>
+
+    <record id="view_delivery_carrier_track_tz" model="ir.ui.view">
+        <field name="name">view_delivery_carrier_track_tz</field>
+        <field name="model">stock.picking</field>
+        <field name="inherit_id" ref="stock.view_picking_form"/>
+        <field name="arch" type="xml">
+            <field name="carrier_tracking_ref" position="replace">
+<!--                <field name="carrier_tracking_ref" class="oe_inline" attrs="{'readonly': [('state', '=', 'done')]}"/> -->
+                <field name="carrier_tracking_ref" class="oe_inline"/>
+            </field>
+        </field>
+    </record>
+
+</odoo>