The receipt is a self-made voucher for internal use. A requisition is a requisition for internal employees to withdraw petty cash in advance before engaging in a certain business. Receipt refers to the approved money drawn from the financial department, which may include expense reimbursement or loan. So it depends on the purpose of the collection. If it is the former, the receipt is the original voucher of the payee's "loan".
Payment receipt process: the purchasing department needs to fill in the payment receipt-approved by the department or approved by the relevant person in charge (according to the company's regulations)-to collect the money from the finance department-to purchase in the market!
Generally, the payment receipt is used when the object of payment and the purpose of payment are clear, but the object of payment and the purpose of payment in the IOU are uncertain. Someone in your company is on a business trip. I'm not sure whether the borrowed travel expenses are travel expenses or accommodation expenses. In this case, IOUs are usually used.