A PRO number is a carrier shipment reference commonly used to track freight. A bill-of-lading number identifies a transport document, while a purchase-order number identifies a buyer’s commercial order. They may be connected, but they should not be assumed to be the same number.
For a public example, Old Dominion’s tracking interface requests PRO numbers. Other providers may call their tracking reference something else. Use the identifier supplied by the carrier handling the shipment.
Match the identifier to the question
| Reference | What it typically identifies | Useful for |
|---|---|---|
| PRO or carrier tracking reference | Carrier’s shipment record | Tracking enquiry |
| BOL number | Bill-of-lading document | Transport-document reconciliation |
| Purchase order | Buyer’s commercial order | Matching a delivery to a purchase |
| Invoice number | A billing document | Payment and charge enquiries |
| Handling-unit identity | A particular pallet or package | Unit-specific differences |
This is a practical dictionary, not a guarantee that every system assigns all five references separately.
One order can have several tracking references
Suppose an illustrative purchase order is delivered through an urgent first shipment and a later pallet shipment. The purchase order remains one commercial record, but each physical shipment needs to be followed using its own carrier reference.
Likewise, multiple purchase orders might be combined in one transport movement. Record their relationship instead of forcing one order number into every field and losing the others.
Avoid copying the wrong number
When asking for an update, say which type of reference you are providing. “Our PO 4500” is clearer than “tracking 4500” when 4500 belongs only to your purchasing system.
Do not invent a carrier reference for a quotation that has not become a confirmed shipment. A quote reference helps find the commercial discussion; it may not be a trackable transport record.
Build a simple cross-reference line
Keep your order number, carrier shipment reference, BOL reference and relevant invoice together. Add the collection date and destination as supporting details, not as substitutes for the identifier.
For an exception involving one unit, provide that unit’s identity and the shipment reference. The split-shipment tracking guide shows a more detailed mapping when several movements belong to one order.
Use WTM’s actual customer records
The WTM Customer Portal lets you review shipment history and available documents. Use the references shown in your records when contacting dispatch. This article does not claim that WTM assigns a PRO number identical to another carrier’s numbering system.
Send the correct shipment reference with your question, plus the specific event you need clarified. For a new movement, use our freight quote form and keep the resulting quotation and confirmed shipment distinguishable as the job progresses.
