Hi,

I am trying to write a module to delete invoices.

I have seen this post https://www.odoo.com/forum/help-1/question/how-to-delete-an-invoice-after-validation-20831 which explains what to do.

I have therefore created a new module delete_invoices with the following code:

/usr/lib/python2.7/dist-packages/openerp/addons/custom/delete_invoices# cat delete_invoices.py
# -*- coding: utf-8 -*-
from openerp import models, fields, api

# DESCRIPTION:
# Class DeleteInvoices allows invoice deletion
# NOTES:
# account_cancel / diary allow cancel entries required

class DeleteInvoices ( models.Model ):
        _inherit = 'account.invoice'

        @api.multi
        def unlink(self):
                for invoice in self:
                        if invoice.state not in ('draft', 'cancel'):
                                raise Warning(_('You cannot delete an invoice which is not draft or cancelled. You should refund it instead.'))
                        # elif invoice.internal_number:
                        #    raise Warning(_('You cannot delete an invoice after it has been validated (and received a number).  You can set it back to "Draft" state and modify its content, then re-confirm it.'))
                return super(account_invoice, self).unlink()

Unfortunately when I try to delete a cancelled invoice I get the following message:

  File "/usr/lib/python2.7/dist-packages/openerp/addons/custom/delete_invoices/delete_invoices.py", line 20, in unlink
    return super(account_invoice, self).unlink()
NameError: global name 'account_invoice' is not defined

Any tips or ideas? Thanks a lot.

For completition I also include __openerp__ and __init__ files:

# cat __init__.py
from . import delete_invoices
# cat __openerp__.py
{
        'name':         'Allow delete invoice',
        'description':  'This module allows to delete invoices once they have been cancelled',
        'author':       'E.M.',
        'depends':      ['account_cancel'],
        'data':         [],
}

Thanks