---
title: "The Retail Operations Guide: EDI 850, 855, 856, and 810 Explained"
description: "Master the core EDI transactions required by major retailers like Amazon, Walmart, and Target. We break down the X12 standards for Orders, Acknowledgments, ASNs, and Invoices."
date: "2025-08-28"
author: "Jayesh Jain"
category: "Electronic Data Interchange (EDI)"
tags: ["EDI", "Retail", "Supply Chain", "X12", "E-commerce"]
keywords: "EDI 850 PO, EDI 855 Acknowledgment, EDI 856 ASN, EDI 810 Invoice, EDI X12 Examples, Amazon EDI Requirements"
featuredImage: "/edi/po-850.jpg"
cta: "Struggling with EDI Compliance?"
ctaDescription: "Our EDI experts can integrate these transactions directly into your ERP."
---

# The Retail Operations Guide: EDI 850, 855, 856, and 810 Explained

## Introduction

If you plan to sell to big-box retailers (Walmart, Target) or digital giants (Amazon Vendor Central), **EDI (Electronic Data Interchange)** is not optional-it's the price of admission. The "Big 4" documents form the backbone of automated retail supply chains.

## 1. EDI 850: Purchase Order (PO)
**Direction:** Retailer -> Supplier
The 850 is the trigger. It tells the supplier what items are being ordered, the quantity, and the shipping destination.

### X12 Sample (850)
```text
ISA*00*          *00*          *ZZ*RetailerID     *ZZ*SupplierID     *250828*1000*U*00401*000000001*0*P*>~
GS*PO*RetailerID*SupplierID*20250828*1000*1*X*004010~
ST*850*0001~
BEG*00*NE*4500123456**20250828~
PO1*1*100*EA*12.99**VN*VENDOR123*UP*123456789012~
CTT*1~
SE*5*0001~
GE*1*1~
IEA*1*000000001~
```

## 2. EDI 855: Purchase Order Acknowledgment (POA)
**Direction:** Supplier -> Retailer
The supplier confirms they can fulfill the order. They can "Accept," "Reject," or "Accept with Changes" (e.g., if price or quantity differs).

### X12 Sample (855)
```text
ST*855*0002~
BAK*00*AC*4500123456*20250828~
PO1*1*100*EA*12.99**VN*VENDOR123~
ACK*IA*100*EA~  (IA = Item Accepted)
SE*5*0002~
```

## 3. EDI 856: Advance Ship Notice (ASN)
**Direction:** Supplier -> Retailer
The most complex and critical document. The ASN must arrive *before* the truck. It details exactly what is in every carton and on every pallet (SSCC-18 labels).
**Note:** Amazon detects discrepancies between the ASN and the physical receipt to issue chargebacks.

### X12 Sample (856)
```text
ST*856*0003~
BSN*00*SHIP12345*20250830*1200*0001~
HL*1**S~ (Shipment Level)
HL*2*1*O~ (Order Level)
PRF*4500123456~
HL*3*2*P~ (Pack/Carton Level)
MAN*GM*00001234567890123456~ (SSCC-18 Label ID)
HL*4*3*I~ (Item Level)
LIN**UP*123456789012~
SN1**10*EA~
SE*10*0003~
```

## 4. EDI 810: Invoice
**Direction:** Supplier -> Retailer
The digital bill. It replaces paper invoices. Major retailers use "3-Way Matching" (PO + ASN/Receipt + Invoice) to approve payments automatically.

### X12 Sample (810)
```text
ST*810*0004~
BIG*20250830*INV98765*20250828*4500123456~
IT1*1*100*EA*12.99**UP*123456789012~
TDS*129900~ (Total Amount: $1299.00)
SE*5*0004~
```

## Conclusion

Mastering these four documents automates 90% of your Order-to-Cash cycle. Failure to implement them correctly often results in "Chargebacks" (fines) from retailers, which can eat up 2-5% of your revenue.