**Impacted versions:** 11.0

**Steps to reproduce:** 

- Configures a user with access to several companies


![administrator odoo](https://user-images.githubusercontent.com/5775695/29488651-46b4cec2-84dd-11e7-9495-e8518e93d336.png)

**Current behavior:**

- In the accounting configuration there is shared field displayed by defects for the sales tax account and purchase tax account
![configure accounting odoo 1](https://user-images.githubusercontent.com/5775695/29488677-f5b53d12-84dd-11e7-8124-831b52423719.png)


**Expected behavior:**

The value of those fields depends on the company. The users that belong to different companies may see by default different values for the field on a given record

Video/Screenshot link (optional):


res = super(ResConfigSettings, self).get_values()
        params = self.env['ir.config_parameter'].sudo()
        tax = self.env['account.tax'].sudo()
        default_purchase_tax_id = literal_eval(params.get_param('account.default_purchase_tax_id', default='False'))
        default_sale_tax_id = literal_eval(params.get_param('account.default_sale_tax_id', default='False'))
        if default_purchase_tax_id and not tax.browse(default_purchase_tax_id).exists():
            default_purchase_tax_id = False
        if default_sale_tax_id and not tax.browse(default_sale_tax_id).exists():
            default_sale_tax_id = False
        res.update(
            default_purchase_tax_id=default_purchase_tax_id,
            default_sale_tax_id=default_sale_tax_id,
        )
        return res
    @api.multi
    def set_values(self):