the actual expenses can be found through the invoice, but not through the memo. Because the water bill can actually be regarded as a voucher of consumption details, such as accommodation water bill and catering water bill, etc., it is more used to ask for self-made consumption vouchers for internal control for the better development of enterprises, and it has no legal effect, and it is impossible to know the real expenses. While invoices mainly reflect the actual consumption amount, such as accommodation invoice and catering invoices, which are more used for accounting and tax returns, so the actual expenses can be found through invoices.