According to the law, as long as the actor has the corresponding civil capacity, the intention is true, and he voluntarily signs for it, the signature has legal effect. As for whether the receipt itself can prove the rights or facts claimed by the parties and whether it has probative force, it needs to be judged according to the specific contents recorded in the receipt, so the signature on the back is also valid.

Settlement bills refer to the important content of payment and settlement, and are invoices and vouchers issued in accordance with the provisions of the tax law when selling or providing services. A settlement voucher is a receipt and payment document obtained when a bank receives and pays money, which can be used by users for reimbursement.