Hi there.

I'm trying to make a custom model extending account.invoice, which will add a button on sales invoice form, to print my new custom report. So far, the button, does trigger my function in custom model (I've put there a warning to test), so now the only thing left seems to run my new custom report somehow. The content of imortant file is:

models.py:

# -*- coding: utf-8 -*-
from openerp import models, fields, api, _
from openerp.exceptions import Warning
class Inv(models.Model):
     _inherit = 'account.invoice'
     _name = 'account.invoice'
     #_name = 'my.inv'
     #_name = 'account.invoice'
     name = fields.Char(string="Title", required=False)
     description = fields.Text()
     #comment = fields.Text()
     @api.multi
     def print_invoice_my(self):
        #raise Warning( _("do something here") )
        #assert len(self) == 1
        #self.sent = True
		#return self.env['report'].get_action(self, 'account.invoice.report_invoice_my')
                return self.env['report'].get_action(self, 'my.report_invoice_my')
		#report_obj = self.env['report']
		#report = report_obj._get_report_from_name('my.report_invoice_my')

my.xml:

<openerp>

   <data>

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

            <field name="name">account.invoice.form.my</field>

            <field name="model">account.invoice</field>

	    <field name="inherit_id" ref="account.invoice_form"/>

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

              <button name="invoice_print" position="after">

  	        <button type="object" name="print_invoice_my" string="my Invoice"/>

		<!--<button name="%(report_invoice_my)d" string="my Invoice" type="action"/>-->

              </button>

            </field>      

        </record>   

   </data>

</openerp>

my_report.xml:

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

<openerp>

    <data>

      <report 

        id="id_report_invoice_my"

        #model="account.invoice"

        model="my"

        string="my Invoice"

        report_type="qweb-pdf"

        name="my.report_invoice_my"

        attachment_use="False"

        file="my.report_invoice_my"

      />

    </data>

</openerp>

report_invoice_my.xml

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

<openerp>

<data>

<template id="report_invoice_my">

    <t t-call="report.external_layout">

        <div class="page">

            <div class="row">

                <h3>Title</h3>

            </div>

        </div>

    </t>

</template>

</data>

</openerp>

I've tried to folow this tutorial

http://www.odoo.yenthevg.com/creating-custom-reports-odoo-8/

However, when trying to hit my button, I get error: "Bad Report Reference" This report is not loaded into the database: my.report_invoice_my.

Posts related to this one are:

https://www.odoo.com/forum/help-1/question/how-to-add-new-button-in-sales-invoice-form-95995

https://www.odoo.com/forum/help-1/question/how-to-connect-button-with-function-96285

https://www.odoo.com/forum/help-1/question/cant-inherit-account-invoice-96458

Can you please suggest how can I fix this, much thanks in advance, best regards.