--- title: "EDI 855 Purchase Order Acknowledgement Integration Services | Tirnav Solutions" description: "EDI 855 Purchase Order Acknowledgement integration services. Automate order acceptance, changes and availability responses across ERP, WMS, 3PL and retail systems." canonical: "https://tirnav.com/edi/855-purchase-order-acknowledgment" --- [Home](https://tirnav.com/)/[EDI Integration](https://tirnav.com/services/edi-integration)/EDI 855 ANSI X12 transaction set 855 # EDI 855 Purchase Order Acknowledgement Integration Services 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. [Get an EDI 855 Assessment](#edi-transaction-contact) [View FAQs](#edi-transaction-faqs) - EDI 855 X12 mapping - PO acknowledgement automation - Order acceptance workflows - ERP and 3PL integration - Partner-specific validation - Exception monitoring Message overview ## What Is an EDI 855 Purchase Order Acknowledgement? 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 Your ERP / TMS / WMS / 3PL EDI 855 sent to partner ↓ Tirnav EDI Platform Validate → Map → Transform → Apply Business Rules ↓ Trading Partner Related order-to-cash flow EDI 850 Purchase OrderEDI 855 AcknowledgmentEDI 856 ASNEDI 810 Invoice Implementation workflow ## EDI 855 integration workflow 1. 01 Receive and match the buyer's EDI 850 to an order in your ERP or OMS 2. 02 Validate item, quantity, price, location and requested-date rules 3. 03 Apply availability and fulfilment business rules 4. 04 Generate an 855 with accepted, changed, backordered or rejected lines 5. 05 Transmit the acknowledgement through the approved partner channel 6. 06 Monitor partner responses and resolve rejected acknowledgements X12 reference ## Common EDI 855 segments 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 ## EDI 855 mapping, validation and transformation Tirnav transforms the partner message into the format required by your ERP, WMS, OMS, 3PL or custom application while applying partner-specific business rules. - X12 855 mapping and transformation - 850-to-855 order matching - Accepted and changed quantity rules - Availability and requested-date logic - SKU and unit-of-measure validation - Partner-specific acknowledgement codes - Reprocessing and exception handling - Production monitoring ### Connect EDI 855 with your systems NetSuiteSAPMicrosoft DynamicsSageOdooCustom ERPWMSOMS3PLEcommerceCustom Backend ### Secure EDI connectivity AS2SFTPVANAPIFTP / FTPSSecure file exchange Exception handling ## Detect and resolve EDI 855 errors 1. 01 Detect rejected, malformed or incomplete messages. 2. 02 Diagnose source data, mapping or business-rule failures. 3. 03 Resolve the issue with the right owner and correction. 4. 04 Reprocess safely while preserving transaction history. Trading partners ## 855 integration for major trading partners [View all partner integrations](https://tirnav.com/services/edi-integration) - [Target.com EDI Integration](https://tirnav.com/services/edi-integration/target) - [Costco EDI Integration](https://tirnav.com/services/edi-integration/costco) - [Amazon Vendor Central EDI Integration](https://tirnav.com/services/edi-integration/amazon) - [Walmart EDI Integration](https://tirnav.com/services/edi-integration/walmart) - [Wayfair EDI Integration](https://tirnav.com/services/edi-integration/wayfair) - [Fry's EDI Integration](https://tirnav.com/services/edi-integration/frys) - [Best Buy EDI Integration](https://tirnav.com/services/edi-integration/best-buy) - [Boots EDI Integration](https://tirnav.com/services/edi-integration/boots) - [Overstock EDI Integration](https://tirnav.com/services/edi-integration/overstock) - [UNFI EDI Integration](https://tirnav.com/services/edi-integration/unfi) - [KeHE EDI Integration](https://tirnav.com/services/edi-integration/kehe) Related transaction sets ## Connect EDI 855 with the complete workflow [EDI 850Purchase Order](https://tirnav.com/edi/850-purchase-order)[EDI 856Advance Ship Notice](https://tirnav.com/edi/856-advance-ship-notice)[EDI 810Invoice](https://tirnav.com/edi/810-invoice)[EDI 997Functional Acknowledgement](https://tirnav.com/edi/997-functional-acknowledgment) ## EDI 855 Purchase Order Acknowledgement FAQs - 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. ## Latest Insights Explore our latest thoughts on technology and business. 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Read Article ](https://tirnav.com/blog/edi-implementation-sps-vs-web-vs-inhouse) [View All Blogs](https://tirnav.com/blog) ## Structured data (JSON-LD) ```json [ { "@context": "https://schema.org", "@graph": [ { "@type": "WebPage", "@id": "https://tirnav.com/edi/855-purchase-order-acknowledgment#webpage", "url": "https://tirnav.com/edi/855-purchase-order-acknowledgment", "name": "EDI 855 Purchase Order Acknowledgement Integration Services", "description": "EDI 855 Purchase Order Acknowledgement integration services. 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