What Costco expects in the 855
Costco trades on X12 4010 over VAN. Costco's 855 follows the standard X12 layout — no partner-specific companion-guide quirks are curated for this document yet. The certified base map covers the standard requirements, and validation still runs against the 855 spec before anything transmits.
How EDISQ maps it
The certified Costco 855 map loads when you enable the partner — fields auto-map from NetSuite, QuickBooks, Dynamics, and 33 other systems, validation runs against Costco's spec before transmission, and the sandbox replays Costco test scenarios until everything passes.
Common rejection reasons
Nearly all 855 rejections trace to reference data, not syntax: identifiers that don't match Costco's cross-references, echoed fields dropped from the original PO, or timing that misses the program window. EDISQ flags each before Costco ever sees the document.
Sample Costco 855
A representative 855 interchange addressed to Costco — envelope, body segments, and control totals:
1ISA*00* *00* *ZZ*ACMESUPPLY *ZZ*COSTCO *260101*1200*U*00401*000000001*0*P*>~ 2GS*PR*ACMESUPPLY*COSTCO*20260101*1200*1*X*004010~ 3ST*855*0001~ 4BAK*00*AC*PO12345*20260101~ 5PO1*1*24*EA*9.75**UP*012345678905~ 6ACK*IA*24*EA~ 7PO1*2*12*EA*14.50**UP*012345678912~ 8ACK*IA*12*EA~ 9CTT*2~ 10SE*8*0001~ 11GE*1*1~ 12IEA*1*000000001~
FAQ
Which 855 version does Costco use?
X12 4010, delivered over VAN. The certified map tracks Costco's current companion guide.
How do I test a Costco 855?
The sandbox generates realistic Costco 855 scenarios against your live mapping — free, unlimited, invisible to Costco.
What does it cost?
Per document only: first 25/month free, then from $0.50, decreasing with volume. No partner or mapping fees.