Hello Rihene ,

Activate developer mode,

Settings > Actions > User-defined Defaults 

And create your record with res.company model

If you want to put by code then you can do it by data in Odoo custom module.

Thanks

hello

Update your code into the method _get_user_currency(). into the res.company object.

or also you can achieve this using the default_get method.

Using Python you can change it like so (I changed it to South African Rand for example):

class ResCompany(models.Model):
    _inherit = 'res.company'

    @api.model
    def _get_euro(self):
        return self.sudo().env.ref('base.ZAR').id