Electronic Data Interchange (EDI)

Electronic Data Interchange (EDI) is the computer-to-computer exchange of business documents — purchase orders, invoices, shipping notices, inventory updates — in a standardized electronic format between trading partners. Rather than sending paper documents or PDF emails that require manual re-entry, EDI transmits structured data files that are processed automatically by each party's business systems. EDI is the backbone of modern supply chain document exchange, handling trillions of dollars in transactions annually.

Why EDI Matters

Before EDI, inter-company document exchange was manual: a retailer's purchasing system would print a purchase order, which would be mailed or faxed to the supplier, who would manually re-enter the data into their own order management system. The process was slow, error-prone, and labor-intensive.

EDI eliminates manual re-entry. A retailer's ERP system generates an electronic PO (in EDI 850 format), transmits it via EDI to the supplier's system, which automatically creates a sales order — no human intervention required. The supplier's system responds with an EDI 855 Purchase Order Acknowledgment. When the goods ship, the supplier sends an EDI 856 Advanced Ship Notice (ASN). The retailer's WMS pre-processes the inbound shipment before the truck arrives.

Common EDI Transaction Sets

The ANSI X12 standard (dominant in North America) and EDIFACT (dominant in Europe) define hundreds of transaction types. The most commonly used:

EDI Compliance and Chargebacks

Large retailers (Walmart, Target, Kroger, Amazon Vendor Central, Home Depot) mandate EDI compliance from their suppliers. Non-compliance or EDI errors trigger chargebacks — financial penalties that can range from $25 to hundreds of dollars per transaction. For high-volume suppliers, maintaining accurate, timely EDI transmissions is a significant compliance function.

Common EDI chargeback triggers:

• Missing or late ASN (856)
• ASN doesn't match the physical shipment
• Invoice (810) doesn't match the PO

EDI Technology Options

Value Added Networks (VANs): Traditional EDI infrastructure where both parties connect through a third-party network (GXS, Sterling Commerce, Inovis). VANs handle routing, translation, and audit trails. Still common but declining.

Direct AS2/AS4: Direct computer-to-computer EDI exchange over the internet using the AS2 protocol. Lower ongoing cost than VANs but requires more technical setup.

API-based EDI platforms: Modern platforms (SPS Commerce, TrueCommerce, Cleo) translate EDI documents into APIs that integrate more easily with modern software — bridging the gap between legacy EDI infrastructure and new SaaS-based business systems.