How do you name a new field in a model? Is there any field name update issue in Odoo v8?

Question

I am adding a new field in a model, while it works fine, I think its name is not being updated. In this case I got '%' as field name, which if I recall correctly it i the first name I gave it. Then I have changed the name t 'Margen de Ventas (%)' as you can see in the code. I have uninstalled and reinstalled the module but it seems stuck with %.
Is this the right way to name new fields? Thanks

# -*- coding: utf-8 -*-
from openerp import models, fields, api
class SaleMarginLines(models.Model):
_

Rihene · Answer

In Odoo 8, you dont need to give a name to your field. It will automatically be named X Sale Margin if you want to add an other name you can add it through string = 'Margen de Ventas (%) ' and digits (4,2).
->
*from openerp import models, fields, api*
*class SaleMarginLines(models.Model):*
*    _inherit = 'sale.order.line',*
* x_sale_margin = fields.Float(string ='Margen de Ventas (%)', digits(4, 2))*

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