What is EDI and Why Is It Such a Pain to Implement?

If you’ve ever worked with enterprise clients in retail, logistics, healthcare, or manufacturing, you’ve probably heard the term EDI thrown around. And if you’ve actually had to implement it, you probably have some strong opinions about it. Let’s break down what EDI is, why it still dominates enterprise commerce in 2026, and why it’s notoriously difficult to get right. What is EDI? EDI stands for Electronic Data Interchange — a standardized method for businesses to exchange documents electronically instead of using paper, email, or manual data entry. Think of it as a language that two companies’ systems speak to each other automatically. Instead of a retailer emailing a purchase order to a supplier, their system sends a structured EDI document directly to the supplier’s system. No humans involved. Common EDI transaction types include: ∙ 850 – Purchase Order ∙ 810** – Invoice ∙ 856 – Advance Ship Notice (ASN) ∙ 997 – Functional Acknowledgment ∙ 855 – Purchase Order Acknowledgment These