855 Purchase Order Acknowledgment (GSA OMS)
GSA (General Services Administration) · X12 004010
GSA (General Services Administration)’s published 855 specification, rendered as an interactive guide. Expand any segment to see its elements, data types, lengths and accepted codes — then validate your own document against it below.
Specification
8 of 8 segments
HEADING
ST
Transaction Set Header ST
pos 010
Optional
max —
BAK
Beginning Segment For Purchase Order Acknowledgment BAK
pos 020
Required
max —
N1 Loop
N1
Name N1
pos 300
Required
max —
DETAIL
PO1 Looprepeats 100000required
PO1
Baseline Item Data PO1
Use this segment when BAK02 is code AC to identify a rejected line item or to identify the corrected line item information when it differs from that information contained in the applicable 850 transaction set.
2. When one or more line items are rejected, identify the line items in this segment and cite the appropriate code in ACK01.
pos 010
Required
max —
ACK Looprepeats 104required
ACK
Line Item Acknowledgment ACK
Use this segment when BAK02 is code AC to provide information related to the line item identified in PO101. If a line item is rejected, cite the appropriate code in ACK01.
pos 270
Required
max —
N9 Looprepeats 1000required
N9
Reference Identification N9
pos 350
Required
max —
SUMMARY
CTT Loop
CTT
Transaction Totals CTT
pos 010
Required
max —
SE
Transaction Set Trailer SE
pos 030
Optional
max —
Validate a 855
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