Under the Verifiable Objective Evidence Principle, no transaction can be recorded in books of account without a supporting Source Document:
- Cash Memo: Prepared by a seller when goods are sold for cash. Details items, quantities, rates, and cash received.
- Invoice / Bill: Prepared by a seller when goods are sold on credit. Original sent to buyer; duplicate retained by seller.
- Receipt: Issued to a customer acknowledging the receipt of cash or cheque.
- Debit Note: Sent by a buyer to a seller when returning damaged goods, stating that the seller's account has been debited.
- Credit Note: Issued by a seller to a buyer acknowledging that the buyer's account has been credited for returned goods.
- Pay-in-Slip & Cheque: Bank deposit slips and unconditional written orders commanding a bank to pay a specified sum.