What should be used as the draft number for a documentary draft collection?

The draft number for a documentary draft collection should reflect a reference that is directly associated with the transaction and paperwork involved. Utilizing the seller's commercial invoice number as the draft number maintains a clear connection to the sale of goods and is a standard practice in international trade. This approach helps ensure that the payment request is directly linked to the documentation that justifies the transaction, facilitating smoother communication between the buyer and seller.

In contrast, while a buyer's purchase order number is relevant, it often serves the buyer's internal tracking methods rather than establishing a direct link to the seller's documentation. A unique shipping reference number may be useful for logistics and tracking shipments but does not provide the same level of intent to pay associated with the invoice. The carrier's service number pertains to shipping and logistics details rather than the financial aspects of the transaction. Each of these alternatives lacks the necessary linkage to the terms of sale that the commercial invoice number represents, making it less appropriate for use as the draft number in this context.