What Is Asn In Warehouse Management System

What is the purpose of ASN?

An ASN, or Advance Ship Notice, tells a warehouse what is coming before the truck arrives. It lets the WMS pre-populate the receiving screen, helps staff schedule dock doors and labor, and flags any difference between what was ordered and what is actually shipping.

What is the difference between ASN and PO?

A purchase order is sent by the buyer to request goods from a supplier. An ASN is sent by the supplier to confirm what is actually being shipped.

A PO says what you want. An ASN says what is on the truck. The two match, but quantities can differ, and a WMS flags those gaps automatically.

When should an ASN be sent?

A supplier should send the ASN as soon as the shipment is packed and handed to the carrier, before the truck leaves their facility.

The earlier the receiving warehouse gets the data, the more time staff have to schedule dock doors, assign labor, and prepare put-away locations.

How do you get your own ASN number?

An ASN number is generated by the supplier's system when they create the shipment record. If you are the buyer, you receive the ASN rather than creating one.

If you are a supplier who needs to send ASNs, your WMS or ERP generates the document and transmits it to the buyer's system, using EDI or a direct API connection.

Can a small distributor use ASN processing without a large ERP?

Yes. A custom warehouse management system can handle ASN data at small scale and sit alongside the accounting software rather than replacing it.

If your suppliers already send ASN data, the WMS just needs to be configured to receive and match it to your existing purchase orders.

How does an ASN speed up the receiving process?

The WMS uses ASN data to pre-populate the receiving screen before the shipment arrives. Staff confirm what they see rather than counting and keying from scratch. That removes most manual data entry, cuts receiving time, and reduces the errors that create inventory discrepancies.

What happens if the ASN does not match the purchase order?

The WMS compares the two automatically and flags any difference. A supplier might ship fewer units than ordered because of damage or stock shortages.

The system shows the gap on the receiving screen so staff can note the discrepancy before the shipment is confirmed, rather than finding it later during a cycle count.

What data fields does an advance ship notice include?

A standard ASN includes the purchase order number, item numbers and descriptions, quantities per item, carrier name and tracking number, expected delivery date, and lot or serial numbers where applicable. These fields give the receiving team everything needed to process the shipment without contacting the supplier for details.

What is the difference between an ASN and a packing slip?

An ASN is a digital document a supplier sends electronically before the shipment leaves, allowing a warehouse system to store the details and prepare staff in advance.

A packing slip is a physical list included inside the shipment itself, only seen once the truck arrives. The ASN essentially acts like a packing list that travels ahead of the freight, giving the receiving team advance visibility rather than information discovered at the dock.

What information should an ASN contain?

An ASN should contain the purchase order number linking the shipment to the original order, item numbers and descriptions confirming the products inside, and quantities per item so staff know how many units to expect. It should also include the carrier and tracking number for tracing freight in transit, an expected delivery date for dock scheduling, and lot or serial numbers when goods are regulated or under warranty tracking.

How does ASN improve warehouse receiving?

ASN improves warehouse receiving by letting the system pre-populate the receiving screen with expected items and quantities before the truck arrives, so staff confirm receipt instead of counting and keying data from scratch. This reduces manual errors, speeds up processing, and allows dock scheduling since arrival times are known in advance.

Discrepancies between what was ordered and what actually shipped are flagged automatically rather than discovered days later.

What is the difference between an ASN and a purchase order?

A purchase order is sent by the buyer to a supplier to request goods, confirming what was ordered and at what price. An ASN is sent by the supplier back to the buyer, confirming what is actually being shipped.

The two match but not always, since suppliers may ship fewer units due to damage or shortages. A warehouse system compares them automatically and flags any differences before receiving begins.