EDI 855 - Purchase Order Acknowledgement

The EDI 855 Purchase Order Acknowledgement is a type of electronic data interchange transaction set that is normally sent by a seller to a buyer in response to an EDI 850 Purchase Order.
EDI-x12 transaction codes

View the full list of EDI X12 documents and transactions

What is EDI 855?

A EDI 855 Purchase Order Acknowledgement is a type of electronic data interchange transaction set that is normally sent by a seller to a buyer in response to an EDI 850 Purchase Order. included in the confirmation the document will tell the buyer if the purchase order was accepted, rejected or requires changes. EDI 855 is often required by large retailers and distributors and may need to be sent in a specified timeframe or at particular step in your order processing workflow to ensure EDI compliance.  

This electronic document complies with the ANSI X12 EDI specification.

Benefits of the EDI 855

All EDI documents are securely encrypted in transit, allowing trading partners to send sensitive data such as pricing and contact information safely. Sending an EDI 855 eliminates the human interaction to confirm orders with customers by email, fax or phone. Additionally, the automated nature of EDI 855 helps reduce errors associated with manual retyping and the number of customer service touchpoints.

For buyers, an EDI 855 can quickly alert them to any order issues, preventing any later issues with supply, invoicing, and payments.

Reduced Manual Effort

Improve Cash Flow

Eliminate Errors

No delays between your customer accepting or rejecting order

How is an EDI 855 Used?

Using Purchase Order Acknowledgment the seller informs the buyer whether the purchase order was accepted, rejected, or accepted with changes (it means that changes were made to the accepted EDI 850 Order)

It is sometimes mistakenly believed that EDI 997 (Functional Acknowledgment) can replace EDI 855. These two EDI messages should not be confused, as they have completely different functions.

EDI 997 is just a notification that Purchase Order (EDI 850) has been delivered and does not contain any validation to the Order.

EDI 855 PO Acknowledgement Segments

Confirms receipt of a Purchase Order (EDI 850) and replies with:
  • The seller’s intention to fulfill the entire order without changes or the refusal to fulfill the order
  • Informs errors and inaccuracies (for example wrong prices, incorrect product numbers, etc.)
  • Informs about change in the PO such as:

             Delivery date changes 
             Backordered or cancelled quantities 
             Inaccurate product identifiers 
             Price discrepancies 
             Inventory out-of-stocks 
             Discontinued items            

EDI 855 PO Acknowledgement Specifications

The EDI 850 X12 Transaction set is used to initiate an order in an industry-standard specified format.


The American National Standards Institute (ANSI) chartered the Accredited Standards Committee (ASC) X12 to develop uniform standards for inter-industry electronic exchange of business transactions, namely electronic data interchange. ASC X12 also contributes to UN/EDIFACT messages that are used widely outside of the United States.

EDI 855 Purchase Order Acknowledgement Transaction Sample

The example below shows the raw EDI data, which is then translated by your business system (ERP) to begin the fulfillment process.

SA*00* *00* *ZZ*111111111 *01*ABCDEFGHI *150129*2215*U*00401*000122406*0*P*>

Frequently Asked Questions

The EDI 855 transaction, also known as the Purchase Order Acknowledgment (POA), is used by suppliers to acknowledge the receipt and acceptance of a purchase order from a buyer. It serves as a confirmation that the order has been acknowledged and will be fulfilled according to the terms specified.

The EDI 855 transaction facilitates order management by providing buyers with timely confirmation from suppliers regarding the status of their purchase orders. This acknowledgment helps buyers track the progress of their orders, verify accuracy, and anticipate delivery dates, enabling better planning and inventory management.

An EDI 855 transaction typically includes key information such as the purchase order number, acknowledgment status (accepted, rejected, or pending), expected shipment dates, quantities accepted or back-ordered, pricing terms, and any relevant comments or exceptions noted by the supplier.

By providing timely acknowledgment and confirmation of purchase orders, the EDI 855 transaction helps streamline communication between buyers and suppliers, reducing the likelihood of errors, discrepancies, and delays in order fulfillment. This enhances supply chain efficiency by improving order accuracy, reducing lead times, and minimizing disruptions.

Buyers should establish clear protocols for interpreting and responding to EDI 855 transactions, including verifying the accuracy of acknowledgment details, reconciling any discrepancies with the original purchase order, and communicating any changes or adjustments to the supplier as needed. Additionally, buyers should monitor EDI 855 transactions regularly to ensure timely receipt and processing.

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Full List of EDI ANSI X12 Documents and Transactions

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