EDI Reference / segments / BAK
BAK
Beginning Segment for PO Acknowledgment
Opens an 855 and echoes the PO.
Key elements
| Element | Name | What it carries |
|---|---|---|
| BAK02 | Acknowledgment Type | AC = ack w/ detail/change, AK = ack no detail. |
| BAK03 | Purchase Order Number | Must match the 850's PO number. |
Key elements only — the ones that matter in retail trade, not the full element list.
Appears in
See a real BAK in context — paste any X12 and the Inspector breaks out every segment.
Inspect an X12 free