I am trying to upgrade custom module in odoo14 to odoo16
the code in custom 14 override  _prepare_move_line_default_vals function an d made changes in it this is the code:

def _prepare_move_line_default_vals(self, write_off_line_vals=None):
    ''' Prepare the dictionary to create the default account.move.lines for the current payment.
    :param write_off_line_vals: Optional dictionary to create a write-off account.move.line easily containing:
        * amount:       The amount to be added to the counterpart amount.
        * name:         The label to set on the line.
        * account_id:   The account on which create the write-off.
    :return: A list of python dictionary to be passed to the account.move.line's 'create' method.
    '''
self.ensure_one()
    write_off_line_vals = write_off_line_vals or {}

    if not self.journal_id.payment_debit_account_id or not self.journal_id.payment_credit_account_id:
        raise UserError(_(
            "You can't create a new payment without an outstanding payments/receipts account set on the %s journal.",
self.journal_id.display_name))

    # Compute amounts.
write_off_amount = write_off_line_vals.get('amount', 0.0)

    if self.payment_type == 'inbound':
        # Receive money.
counterpart_amount = -self.amount
        write_off_amount *= -1
elif self.payment_type == 'outbound':
        # Send money.
counterpart_amount = self.amount
    else:
        counterpart_amount = 0.0
write_off_amount = 0.0

balance = counterpart_amount / self.currency_rate
    counterpart_amount_currency = counterpart_amount
    write_off_balance = self.currency_id._convert(write_off_amount, self.company_id.currency_id, self.company_id, self.date)
    write_off_amount_currency = write_off_amount
    currency_id = self.currency_id.id

    if self.is_internal_transfer:
        if self.payment_type == 'inbound':
            liquidity_line_name = _('Transfer to %s', self.journal_id.name)
        else: # payment.payment_type == 'outbound':
liquidity_line_name = _('Transfer from %s', self.journal_id.name)
    else:
        liquidity_line_name = self.payment_reference

    # Compute a default label to set on the journal items.

payment_display_name = {
        'outbound-customer': _("Customer Reimbursement"),
'inbound-customer': _("Customer Payment"),
'outbound-supplier': _("Vendor Payment"),
'inbound-supplier': _("Vendor Reimbursement"),
}

    default_line_name = self.env['account.move.line']._get_default_line_name(
        _("Internal Transfer") if self.is_internal_transfer else payment_display_name['%s-%s' % (self.payment_type, self.partner_type)],
self.amount,
self.currency_id,
self.date,
partner=self.partner_id,
)

    line_vals_list = [
        # Liquidity line.
{
            'name': liquidity_line_name or default_line_name,
'date_maturity': self.date,
'amount_currency': -counterpart_amount_currency,
'currency_id': currency_id,
'debit': balance < 0.0 and -balance or 0.0,
'credit': balance > 0.0 and balance or 0.0,
'partner_id': self.partner_id.id,
'account_id': self.journal_id.payment_debit_account_id.id if balance < 0.0 else self.journal_id.payment_credit_account_id.id,
},
# Receivable / Payable.
{
            'name': self.payment_reference or default_line_name,
'date_maturity': self.date,
'amount_currency': counterpart_amount_currency + write_off_amount_currency if currency_id else 0.0,
'currency_id': currency_id,
'debit': balance + write_off_balance > 0.0 and balance + write_off_balance or 0.0,
'credit': balance + write_off_balance < 0.0 and -balance - write_off_balance or 0.0,
'partner_id': self.partner_id.id,
'account_id': self.destination_account_id.id,
},
]
    if write_off_balance:
        # Write-off line.
line_vals_list.append({
            'name': write_off_line_vals.get('name') or default_line_name,
'amount_currency': -write_off_amount_currency,
'currency_id': currency_id,
'debit': write_off_balance < 0.0 and -write_off_balance or 0.0,
'credit': write_off_balance > 0.0 and write_off_balance or 0.0,
'partner_id': self.partner_id.id,
'account_id': write_off_line_vals.get('account_id'),
})
    return line_vals_list



i need to convert it to odoo16 with the same changes in custom 14 how can i do that?
this the code of this function in odoo 16:
def _prepare_move_line_default_vals(self, write_off_line_vals=None):
    ''' Prepare the dictionary to create the default account.move.lines for the current payment.
    :param write_off_line_vals: Optional list of dictionaries to create a write-off account.move.line easily containing:
        * amount:       The amount to be added to the counterpart amount.
        * name:         The label to set on the line.
        * account_id:   The account on which create the write-off.
    :return: A list of python dictionary to be passed to the account.move.line's 'create' method.
    '''
self.ensure_one()
    write_off_line_vals = write_off_line_vals or {}

    if not self.outstanding_account_id:
        raise UserError(_(
            "You can't create a new payment without an outstanding payments/receipts account set either on the company or the %s payment method in the %s journal.",
self.payment_method_line_id.name, self.journal_id.display_name))

    # Compute amounts.
write_off_line_vals_list = write_off_line_vals or []
    write_off_amount_currency = sum(x['amount_currency'] for x in write_off_line_vals_list)
    write_off_balance = sum(x['balance'] for x in write_off_line_vals_list)

    if self.payment_type == 'inbound':
        # Receive money.
liquidity_amount_currency = self.amount
    elif self.payment_type == 'outbound':
        # Send money.
liquidity_amount_currency = -self.amount
    else:
        liquidity_amount_currency = 0.0

liquidity_balance = self.currency_id._convert(
        liquidity_amount_currency,
self.company_id.currency_id,
self.company_id,
self.date,
)
    counterpart_amount_currency = -liquidity_amount_currency - write_off_amount_currency
    counterpart_balance = -liquidity_balance - write_off_balance
    currency_id = self.currency_id.id

    # Compute a default label to set on the journal items.
liquidity_line_name = ''.join(x[1] for x in self._get_liquidity_aml_display_name_list())
    counterpart_line_name = ''.join(x[1] for x in self._get_counterpart_aml_display_name_list())

    line_vals_list = [
        # Liquidity line.
{
            'name': liquidity_line_name,
'date_maturity': self.date,
'amount_currency': liquidity_amount_currency,
'currency_id': currency_id,
'debit': liquidity_balance if liquidity_balance > 0.0 else 0.0,
'credit': -liquidity_balance if liquidity_balance < 0.0 else 0.0,
'partner_id': self.partner_id.id,
'account_id': self.outstanding_account_id.id,
},
# Receivable / Payable.
{
            'name': counterpart_line_name,
'date_maturity': self.date,
'amount_currency': counterpart_amount_currency,
'currency_id': currency_id,
'debit': counterpart_balance if counterpart_balance > 0.0 else 0.0,
'credit': -counterpart_balance if counterpart_balance < 0.0 else 0.0,
'partner_id': self.partner_id.id,
'account_id': self.destination_account_id.id,
},
]
    return line_vals_list + write_off_line_vals_list