Schema Reference
21 segments · X12 855 Purchase Order Acknowledgment
Automating UPS EDI 855
Stacksync validates, transforms, and delivers your 855 transactions automatically — so your team can focus on operations, not EDI compliance.
UPS EDI 855 FAQ
Common questions about 855 Purchase Order Acknowledgment transactions with UPS.
How quickly must I respond to a UPS 850 with an EDI 855?
UPS compliance programs generally require an EDI 855 Purchase Order Acknowledgment within 24 to 48 hours of receiving the 850. Some UPS business units or time-sensitive product categories may have tighter windows. Failing to acknowledge within the deadline can result in compliance penalties, reduced scorecard ratings, and in some cases automatic PO cancellation. Stacksync can send 855 acknowledgments automatically the moment your system processes the incoming PO, well within UPS's required timeframe. The platform logs every acknowledgment with timestamps for compliance auditing.
What status codes can be sent in a UPS EDI 855?
The UPS EDI 855 supports several acknowledgment status codes in the BAK and ACK segments: accepted as ordered (AC), accepted with changes (AD), backorder (BO), rejected (RJ), and item not found (IF). You can acknowledge the entire PO at the header level or respond line by line with different statuses — for example, accepting most items while backordering one and rejecting another. Stacksync lets you define business rules that automatically assign these status codes based on your inventory availability, pricing validation, and fulfillment capacity, removing the need for manual line-by-line review.
Is an EDI 855 required for every UPS Purchase Order?
Most UPS compliance programs require an 855 for every 850 PO received. However, some UPS divisions or product categories may not enforce the requirement, especially for smaller suppliers or specific fulfillment models. Even when not strictly mandatory, sending an 855 is best practice — it confirms receipt, prevents duplicate PO transmissions, and establishes a clear audit trail. Stacksync configures 855 responses per UPS business unit, so you can automate acknowledgments where required while handling exceptions for divisions with different compliance expectations.
What happens if I reject a line item in a UPS EDI 855?
When you reject a line item in the UPS 855 using the RJ status code, UPS's ordering system is notified that you cannot fulfill that specific item. Depending on UPS's policies, they may issue a revised 850 with alternative items, cancel the line, or source the product from another supplier. Partial rejections — where you accept some lines and reject others — are common and supported through line-level ACK segments. Stacksync tracks rejected lines and can trigger alerts so your sales or fulfillment team can follow up with UPS proactively.
Can Stacksync automate UPS EDI 855 responses?
Yes. Stacksync automates UPS 855 responses by connecting to your inventory and order management systems. When a UPS 850 arrives, Stacksync checks stock levels, validates pricing against your catalog, and confirms fulfillment capacity. Based on configurable business rules, it generates the appropriate 855 with acceptance, modification, or backorder status codes — all without manual intervention. You can set thresholds for automatic acceptance (e.g., accept if all items are in stock) and escalate edge cases to your team for review. The entire response cycle typically completes in under a minute.
