So in my project I need to deal with multitude of chart_templates to setup,

and well I supose why not just update them and reaload them directly with our main accounting use in france : 

    def ensure_chart_template(self, company_id, chart_template = 'fr'):

        try:

            company = self.env['res.company'].browse(company_id)

            if not company.chart_template:

            # Set the selection value directly, e.g. 'l10n_fr'

                print(f"Setting chart template for company {company.name} to {chart_template}")

                company.chart_template = chart_template

                self.env['account.chart.template'].try_loading(company.chart_template, company=company)

        except Exception as e:

            print(f"Erreur dans ensure_chart_template pour la société {company_id}: {e}")

            return {"type": "error", "message": f"Erreur dans ensure_chart_template: {e}"}, True

SO PERFECT we i do so i get this :

So from what i understand as expected we can still change it for now the package because we didn't creat an invoice.

When i creat one I get this : 

am I missing something ?

in the res_config_settings.py  i just noticed thoses 2 functions :

    def set_values(self):

        super().set_values()

        # install a chart of accounts for the given company (if required)

        if self.env.company == self.company_id and self.chart_template \

        and self.chart_template != self.company_id.chart_template:

            self.env['account.chart.template'].try_loading(self.chart_template, company=self.company_id)

    def reload_template(self):

        self.env['account.chart.template'].try_loading(self.company_id.chart_template, company=self.company_id)

I don't see what else could be wrong ? maybe the chart_template i'm using. (in odoo 18)

I also tryed l10n_fr_account and l10n_fr that i have activated but they don't work.

sends me an error when i select it

Thank you guys !! 

have a nice day !