I've added a couple of fields in this code:
<tree string="Sales Order Lines" editable="bottom">
<field name="x_ancho" invisible="1"/>
<field name="x_alto" invisible="1"/>
</tree>
but when you add a product from the sales quotation line, the agrege camposque me appear as disabled and can not enable them to be able to enter values.
Your question is unclear. Please fix it.