I am trying to create a new label format in my Odoo v.16 online version.

I would like this option format to appear as an option when I use the "print labels" (action_open_label_layout) button.

From what I learned I need some python code for that and so I created everything by a custom module.

In the module I define:

• the new paper format (as record)
• 2 actions to open the report from product.product and product.template (as records)
• 3 views (as templates)
• • 1 view for the label desing
  • 1 view that hands over data if triggered by action of product.product
  • 1 view that hands over data if triggered by action of product.template
• 1 python code model to add the new report as print_format

The module is successfully imported. Paper format is there, the action_reports are there, the views are there.

If I go to the action_reports and use the button "add to print menu" (method: create_action) the reports appear as a print button on my product overviews and they work. So I would suppose this is all fine.

But no matter what I try I cannot add this reports to the "print_format" selection.

This is the code of the python module that I use to activate (and I have already changed  altered it many times without success so there is some unneccessary stuff imported still)

Of course the part "my_module_name" is replaced with my actual module name.

Can anybody help me solve this issue?

import datetime
from collections import defaultdict
from itertools import groupby
from odoo import api, fields, models, _
from odoo.exceptions import AccessError, UserError
from odoo.tools import date_utils, float_round, float_is_zero


class ProductLabelLayout(models.TransientModel):
    _inherit = 'product.label.layout'

    print_format = fields.Selection(selection_add=[
        ('label_62x29', 'Brother 62x29'), ], ondelete={'label_62x29': 'set default'})

    def _prepare_report_data(self):
        xml_id, data = super()._prepare_report_data()

        if 'label_62x29' in self.print_format:
            xml_id = 'my_module_name.action_report_62x29'

            data = {
                'active_model': active_model,
                'product_tmpl_name': self.product_tmpl_ids.name,
                'product_tmpl': self.product_tmpl_ids,
                'product_name': self.product_ids.name,
                'product_id': self.product_ids,
            }
        return xml_id, data

    def process(self):
        action = super(ProductLabelLayout, self).process()
        self.ensure_one()
        xml_id, data = self._prepare_report_data()
        if not xml_id:
            raise UserError(_('Unable to find report template for %s format', self.print_format))
        report_action = self.env.ref(xml_id).report_action(None, data=data)
        report_action.update({'close_on_report_download': True})
        return action
        

class ReportProductLabelTag(models.AbstractModel):
    _name = 'my_module_name.action_report_62x29'
    _description = 'Brother 62x29'

    def _get_report_values(self, docids, data):
        if data.get('active_model') == 'product.template':
            Product = self.env['product.template']
        elif data.get('active_model') == 'product.product':
            Product = self.env['product.product']
        else:
            raise UserError(
                _('Product model not defined, Please contact your administrator.'))
        return {
            'doc_ids': docids,
            'data': data,
        }