class account_invoice_serial(models.Model):
    _name = 'account.invoice.serial'
    _description = "Product serial numbers"
    _order = 'name'

    name = fields.Char('Serial Number',track_visibility='always')
    line_id = fields.Many2one('account.invoice.line',)
    product_id = fields.Many2one('product.product', string='Product',)

class account_invoice_line(models.Model):
    _inherit = 'account.invoice.line' 
    serial_number_ids = fields.One2many(comodel_name='account.invoice.serial', inverse_name='line_id', string='Serial numbers', readonly=False, copy=False)

<record id="invoice_form" model="ir.ui.view">

      <field name="name">account.invoice.form</field>

      <field name="model">account.invoice</field>

      <field name="inherit_id" ref="account.invoice_form" />

 <field name="arch" type="xml">  <xpath expr="//tree/field[@name='name']" position="after">  <field name="serial_number_ids" widget="One2many_list" options="{'no_create': True, 'no_create_edit': True }" /> 
 </xpath> 
</field>
</record>

I want to display a list of "names", instead I get a list of record ids. Are there a better widget to use?

This is my current work-a-round:

class account_invoice_line(models.Model):
    _inherit = 'account.invoice.line'
    serial_number_ids = fields.One2many(comodel_name='account.invoice.serial', inverse_name='line_id', string='Serial numbers', readonly=False, copy=False)
    def _serial_numbers(self):
        self.serial_numbers = ', '.join([s.name for s in self.serial_number_ids])
    serial_numbers = fields.Char('Serial Numbers',compute="_serial_numbers",readonly=True)