Final answer:
The document not commonly associated with the 'cash receipts' class of transactions is a purchase order, as it pertains to the purchasing process rather than the receipt of cash.
Step-by-step explanation:
The document not commonly associated with the "cash receipts" class of transactions is purchase orders. When we talk about cash receipts, we are referring to documentation that supports the receipt of cash into the business. Common documents for recording such transactions include sales receipts, bank deposit slips, and cash register tapes. These documents serve as proof that a sale was made, and cash was received and deposited into a company's bank account. A purchase order, however, is related to the buying side of transactions - it is an official offer issued by a buyer to a seller indicating types, quantities, and agreed prices for products or services.