@api.model
def write(self, values):
    invoice_paid_amount = 0
    res = super(AccountMove, self).write(values)
    if 'state' in values and values['state'] == 'posted':
        invoice_id = self.env['account.move'].search([('name', '=', self.ref)])
        if invoice_id.type == 'out_invoice':
            invoice_paid_amount += abs(invoice_id.amount_total - invoice_id.amount_residual)
            print("invoice_paid_amount", invoice_paid_amount)


        else:
            print("error")
    return res