What are ORDERS, ORDRSP, DESADV and INVOIC: the EDI messages explained

In wholesale fashion, four EDI messages form the backbone of order processing: ORDERS, ORDRSP, DESADV and INVOIC. These standardised electronic documents carry structured data between retailers and suppliers, automating purchase orders, confirmations, shipping notices and invoices. Retailers require them for compliance, faster payment cycles and error reduction, and suppliers that cannot send them risk losing shelf space.

What is EDI and why does wholesale fashion use it?

Electronic Data Interchange (EDI) replaces paper documents and manual data entry with machine-readable messages exchanged directly between trading partners' systems. Developed in the 1960s and standardised in formats such as EDIFACT (used widely in Europe) and ANSI X12 (North America), EDI ensures that each party reads the same data in the same order, reducing transcription errors and speeding up the order-to-cash cycle.

In fashion wholesale, speed and accuracy are critical. A single retail chain may place thousands of purchase orders per season across hundreds of suppliers. Manual re-keying of order data leads to mistakes in style numbers, sizes, colours and delivery dates, causing stock-outs, overshipments and invoice disputes. EDI eliminates these risks by transmitting structured, validated data automatically.

What does an ORDERS message contain?

The ORDERS message is the digital purchase order sent from retailer to supplier. It contains all the information needed to fulfil an order:

• Buyer and supplier identification (GLN codes)
• Purchase order number and order date
• Delivery location and requested delivery date
• Line items: product codes (EAN or GTIN), descriptions, quantities, unit prices
• Payment terms and currency
• Shipping instructions and any special requirements

The ORDERS message may also specify pack sizes, carton configurations and labelling requirements, particularly for large retailers with distribution centre automation. Once transmitted, the supplier's system ingests the order without manual intervention, triggering production planning, inventory allocation and warehouse workflows.

What is the purpose of the ORDRSP message?

ORDRSP (Order Response) is the supplier's formal acknowledgement of the purchase order. It confirms which line items the supplier accepts, which it rejects, and any changes to quantities or delivery dates. The message mirrors the structure of the ORDERS document but adds status codes for each line: accepted, rejected, or accepted with changes.

For example, if a retailer orders 500 units of a particular SKU but the supplier has only 300 in stock, the ORDRSP will confirm 300 and flag the shortfall. The retailer's system can then automatically adjust inventory forecasts, revise replenishment plans or source the balance elsewhere. Without ORDRSP, buyers must chase suppliers by email or phone, delaying decisions and increasing the risk of miscommunication.

How does the DESADV message work?

DESADV (Despatch Advice) is the advance shipping notice sent by the supplier when goods leave the warehouse. It tells the retailer exactly what is on the truck, how it is packed, and when it will arrive. Key data elements include:

• Shipment number and despatch date
• Carrier and tracking details
• Delivery date and destination
• Packing structure: number of pallets or cartons, contents of each
• Line-level detail: GTINs, quantities, batch or serial numbers

Retailers use DESADV data to plan labour at distribution centres, prepare receiving bays, and update inventory systems before goods arrive. If the despatch advice does not match the original purchase order, the retailer's system flags the discrepancy, allowing staff to investigate before unloading. Many large retailers will refuse to accept deliveries without a valid DESADV, as manual checking is too slow and error-prone.

Why must the INVOIC message match the other documents?

INVOIC is the electronic invoice issued by the supplier after despatch. It must reference the original purchase order number and match the quantities and prices in the DESADV. Retailers' accounts payable systems perform a three-way match: ORDERS (what was ordered), DESADV (what was shipped) and INVOIC (what is being billed). If all three agree, payment is approved automatically. If they do not, the invoice is held for manual review, delaying payment by weeks or months.

Common mismatches include price discrepancies (the supplier invoices a higher unit price than agreed), quantity differences (billing for more units than shipped), or missing purchase order references. EDI does not eliminate these errors entirely, but it surfaces them immediately and in a structured format, allowing faster resolution than paper invoices buried in email inboxes.

What happens if a supplier cannot send EDI messages?

Retailers increasingly mandate EDI for all wholesale suppliers. Large chains have delisted or fined vendors that cannot comply, as manual order processing increases costs and errors. Smaller suppliers often rely on third-party EDI service providers or web portals that convert manual data entry into standard messages, but these add cost and complexity.

The shift to EDI compliance has accelerated as retailers invest in supply chain visibility and just-in-time inventory. Real-time data from ORDERS, ORDRSP, DESADV and INVOIC feeds demand forecasting, warehouse management and financial planning systems. Suppliers that cannot provide it risk losing competitiveness, particularly in sectors such as fast fashion and grocery retail where margins are thin and operational precision is paramount.