Hi, I don't know what happened because I created and installed a new module, but the menu item is hidden or not set like others menu. My xml view is configured like this:

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>

        <record id="e_retenciones_action" model="ir.actions.act_window">
            <field name="name">Retenciones</field>
            <field name="type">ir.actions.act_window</field>
            <field name="res_model">e.retenciones</field>
            <field name="view_type">form</field>
            <field name="view_mode">tree,form</field>
            <field name="help" type="html">
                <p class="oe_view_nocontent_create">
                    There is no examples click here to add new ModelTitle.
                </p>
            </field>
        </record>

        <menuitem
            id="e_retenciones_menu"
            name="Retenciones ODOO"
            action="e_retenciones_action"
            parent=""
            sequence="0" />

        <record id="e_retenciones_view_form" model="ir.ui.view">
            <field name="name">Retenciones ODOO</field>
            <field name="model">e.retenciones</field>
            <field name="arch" type="xml">
                <form>
                    <group>
                        <field name="razonSocial" />
                    </group>
                </form>
            </field>
        </record>

        <record id="e_retenciones_view_tree" model="ir.ui.view">
            <field name="name">Retenciones ODOO List</field>
            <field name="model">e.retenciones</field>
            <field name="arch" type="xml">
                <tree>
                    <field name="razonSocial"/>
                </tree>
            </field>
        </record>
    </data>
</odoo>

And my model have this:

from odoo import fields, models, api
class eRetenciones (models.Model):
    _name = 'e.retenciones'
    _description = 'Retenciones ODOO'
    razonSocial = fields.Char(string="Razón Social")

Please somebody can help me with that. Thanks a lot.