pos/pos_session_pay_invoice/views/account_bank_statement.xml

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
    <act_window
            id="action_cash_invoice_in_from_statement"
            name="Pay invoice"
            res_model="cash.invoice.in"
            src_model="account.bank.statement"
            view_mode="form"
            target="new"
            key2="client_action_multi"
        />
        <act_window
            id="action_cash_invoice_out_from_statement"
            name="Collect Payment from Invoice"
            res_model="cash.invoice.out"
            src_model="account.bank.statement"
            view_mode="form"
            target="new"
            key2="client_action_multi"
        />
</odoo>