ANSI X12 transaction set 855
Automate EDI 855 purchase-order acknowledgements between your ERP, fulfilment systems and trading partners.
Tirnav maps purchase-order status, accepted quantities, requested-date changes and item exceptions into the EDI 855 format required by your trading partners. Connect supplier acknowledgements to NetSuite, SAP, Odoo, Microsoft Dynamics, WMS, 3PL and custom systems.
Message overview
EDI 855 communicates a supplier's response to a buyer's purchase order. It can confirm acceptance, identify changes, communicate unavailable items or provide the status needed for the buyer to plan fulfilment.
Typical message flow
Related order-to-cash flow
Implementation workflow
Receive and match the buyer's EDI 850 to an order in your ERP or OMS
Validate item, quantity, price, location and requested-date rules
Apply availability and fulfilment business rules
Generate an 855 with accepted, changed, backordered or rejected lines
Transmit the acknowledgement through the approved partner channel
Monitor partner responses and resolve rejected acknowledgements
X12 reference
Segment requirements vary by trading partner and implementation guide. These are common examples, not a universal requirement list.
| Segment | Business meaning | Implementation notes |
|---|---|---|
| ISA / GS | Control headers | Identify the EDI interchange and functional group that contain the purchase-order acknowledgment. |
| ST / SE | Transaction envelope | Open and close the individual EDI 855 transaction set and provide transaction control information. |
| BAK | Beginning segment | Identifies the acknowledgment purpose, purchase order reference, acknowledgment number and response date. |
| REF | Reference identification | Carries purchase-order, vendor, customer and other trading-partner reference information. |
| DTM | Date and time | Communicates acknowledgment, requested delivery, promised delivery and other relevant dates. |
| N1 / N2 / N3 / N4 | Party and location | Identifies buyers, suppliers, ship-to locations and other parties when required by the implementation guide. |
| PO1 | Acknowledged line item | Identifies the purchase-order line and communicates item, quantity, unit of measure and pricing information. |
| ACK | Acknowledgment status | Communicates line-level acceptance, rejection, changes, backorders, availability, quantities and promised delivery information. |
| CTT | Transaction totals | Provides control totals such as the number of purchase-order lines included in the acknowledgment. |
| GE / IEA | Group and interchange trailers | Close the functional group and EDI interchange and provide control counts for validation. |
Mapping and operations
Tirnav transforms the partner message into the format required by your ERP, WMS, OMS, 3PL or custom application while applying partner-specific business rules.
Exception handling
Detect rejected, malformed or incomplete messages.
Diagnose source data, mapping or business-rule failures.
Resolve the issue with the right owner and correction.
Reprocess safely while preserving transaction history.
Trading partners
Related transaction sets
EDI 855 is the ANSI X12 Purchase Order Acknowledgement used by a supplier to confirm receipt, acceptance or changes to an EDI 850 purchase order.
An 855 is sent after the purchase order is received and evaluated, with timing and required status values defined by the trading-partner implementation guide.
Yes. Where supported by the partner specification, line-level responses can communicate accepted, changed, unavailable, backordered or rejected quantities.
Yes. Tirnav maps order status and fulfilment decisions from NetSuite, SAP, Odoo, Microsoft Dynamics or custom systems into the partner-specific 855 format.
The 850 is the buyer's purchase order; the 855 is the supplier's response to that order. Together they establish a controlled order-confirmation workflow.
Yes. Monitoring can identify validation failures, mismatched order references, unavailable items and transmission exceptions for correction and reprocessing.
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