I want to add a field in 'line_ids' of bank statement line , but I got error when trying with this code . Any help please ?

Thanks.

class AccountBankStatementLine(models.Model):

    _inherit = "account.bank.statement.line"

    my_field = fields.Many2one('model.model', string="My field")

 <record id="view_bank__inherit" model="ir.ui.view">
            <field name="name">bank.statement.inherit</field>
            <field name="model">account.bank.statement.line</field>
            <field name="inherit_id" ref="account.view_bank_statement_form"/>
            <field name="arch" type="xml">
                <xpath expr="//notebook/page[@name='line_ids']/field/tree/field[@name='partner_id']" position="after" >
                    <field name="my_field" />
                </xpath>
            </field>
        </record>