Hello

How can I show in the view: id = "product_template_product_form_view" the total field = fields.Float ('total', compute = '_ getamount') of class class AccountTax (models.Model) ?

this is my code:

ratio.py :

from odoo import fields, models, api, tools


class ProductTemplate(models.Model):
    _name = 'product.template'
    _inherit = 'product.template'

    pventa_iva = fields.Float('PVP (IVA)')
    pcompra_iva = fields.Float('COSTE (IVA)')
    ratio = fields.Float('Ratio')
    iva = fields.Integer('datos iva', compute='_venta_iva')
    cant = fields.Many2many(comodel_name='account.tax', string='Tasas')
    impuestos = fields.Float(compute='_compute_impuestos')

    @api.depends('taxes_id')
    def _venta_iva(self):
        for record in self:
            record.iva = record.taxes_id


class AccountTax(models.Model):
    _name = 'account.tax'
    _inherit = 'account.tax'

    total = fields.Float('total', compute='_getamount')

    @api.depends('amount')
    def _getamount(self):
        for record in self:
            record.total = record.amount


And this is my view: 

<record id="product_template_product_form_view" model="ir.ui.view">
    <field name="name">product.template.product.form</field>
    <field name="model">product.template</field>
    <field name="inherit_id" ref="product.product_template_only_form_view"/>
    <field name="arch" type="xml">
        <field name="list_price" position="before">
            <field name="ratio"/>
             <!-- <field name="amount" ref="account.view_tax_form"/> -->
        </field>
        <field name="list_price" position="after">
            <field name="pventa_iva"/>
        </field>
        <field name="uom_id" position="before">
            <field name="pcompra_iva"/>
            <field name="iva"/>
            <span t-esc="o._getamount"/>
             <!-- <field name="total" ref="vista_iva"/>-->
            <field name="cant"/>
            <field name="impuestos"/>
            <field name="taxes_id" widget="many2many_tags" on_change="1" can_create="true" can_write="true" modifiers="{}"/>
            </field>
    </field>
</record>

<record id="vista_iva" model="ir.ui.view">
    <field name="name">vista.iva</field>
    <field name="model">account.tax</field>
    <field name="inherit_id" ref="account.view_tax_form"/>
    <field name="arch" type="xml">
        <field name="amount" position="after">
            <field name="total"/>
        </field>
    </field>
</record>