What is EDI 850 vs EDI 855?

Definition

EDI 850 vs EDI 855 compares two connected electronic transactions used in business-to-business purchasing. EDI 850 is the purchase order a buyer sends to a supplier, while EDI 855 is the purchase order acknowledgment a supplier sends back to confirm how the order will be handled.

The distinction is important because the two transactions represent different points in the procurement communication cycle. The EDI 850 communicates the buyer's requested order, while the EDI 855 communicates the supplier's response to that order. Together, they create a structured exchange that helps trading partners maintain consistent order information.

Table of Contents

EDI 850 Purchase Order

An EDI 850 communicates the buyer's purchasing requirements to the supplier. It can contain the purchase order number, transaction date, buyer and supplier identifiers, item numbers, quantities, prices, requested delivery dates, shipping information, and applicable commercial terms.

The transaction normally begins after a purchase requisition has been reviewed and approved through the buyer's procurement controls. The resulting purchase order becomes the formal instruction sent to the supplier. This makes the EDI 850 an important document for sourcing, approvals, spend visibility, and procure-to-pay processes.

EDI 855 Purchase Order Acknowledgment

An EDI 855 communicates the supplier's response to the EDI 850. Depending on the trading-partner agreement and transaction details, the supplier can acknowledge the order as accepted, rejected, or accepted with changes. The acknowledgment can also identify specific line items, quantities, dates, or other conditions that differ from the original order.

For example, a buyer may send an EDI 850 requesting 100 units for delivery on June 15. The supplier's EDI 855 could confirm all 100 units for that date, acknowledge only part of the quantity, or communicate a different fulfillment date. The buyer can then use that response to update purchasing expectations and coordinate downstream activities.

EDI 850 vs EDI 855: Key Differences

  • Purpose: EDI 850 communicates a purchase order, while EDI 855 communicates the supplier's acknowledgment of that order.
  • Direction: EDI 850 generally moves from buyer to supplier; EDI 855 generally moves from supplier to buyer.
  • Business event: EDI 850 represents an order request, while EDI 855 represents the supplier's response to that request.
  • Information: EDI 850 contains requested products, quantities, prices, and delivery requirements; EDI 855 confirms or modifies the supplier's commitment to those requirements.
  • Timing: EDI 855 follows the supplier's receipt and processing of the EDI 850.

Both transactions support an auditable purchasing trail. A buyer can compare the original purchase order with the acknowledgment to identify confirmed quantities, changed dates, or rejected lines before fulfillment progresses.

How EDI 850 and EDI 855 Fit Into the Transaction Flow

A typical flow starts with purchasing requirements, sourcing, approval, and creation of the buyer's purchase order. The EDI 850 then transmits those requirements to the supplier. After receiving and validating the order, the supplier returns an EDI 855 with its acknowledgment.

The confirmed order can subsequently support receiving and invoice processing, where invoice information is captured, validated, matched against relevant records, coded, approved, and posted. This connection helps finance teams maintain consistency between what was ordered, what was supplied, and what was ultimately billed.

In sales-related environments, the PO in Sales: Purchase Orders in the Sales Cycle Guide provides useful context for understanding how purchase orders interact with sales orders and broader transaction flows. The same purchase order information can support procurement controls and downstream financial records.

EDI 850 and EDI 855 are part of a broader family of structured business transactions. An EDI Invoice communicates billing information after goods or services are supplied, connecting the commercial transaction with accounts payable and financial processing.

An EDI Tax Filing can support electronic exchange of tax-related information, while an EDI Payment File can support structured payment instructions after financial obligations have been approved. These transactions serve different purposes, so they should not be treated as substitutes for the EDI 850 or EDI 855.

Practical Use and Best Practices

Organizations using EDI 850 and EDI 855 should establish clear trading-partner rules for required fields, acknowledgment codes, timing, and handling of changed order lines. The buyer should also retain the original EDI 850 together with the corresponding EDI 855 so that purchasing teams can trace the evolution of an order.

When a supplier's acknowledgment differs from the original order, the difference should be visible to the appropriate purchasing or finance team before subsequent transactions rely on the changed information. Maintaining consistent item identifiers, quantities, units of measure, prices, and delivery dates also improves downstream matching and reconciliation.

Clear controls around requisitions, approvals, purchase orders, and supplier acknowledgments help organizations maintain reliable procurement records. The result is better visibility into commitments and a stronger foundation for accurate financial reporting.

Summary

EDI 850 and EDI 855 serve complementary roles in electronic purchasing. The EDI 850 sends the buyer's purchase order to the supplier, while the EDI 855 communicates the supplier's acceptance, rejection, or relevant changes. Understanding the distinction helps businesses manage procurement controls, supplier commitments, order accuracy, and downstream financial processes.