A partial list of transaction-set control and data item segments-for ANSI x12 Transaction Set Stantdard 859 (Purchase Order)-in sequential order.
| CONTROL/DATA ITEM SEGMENT | DESCRIPTION |
| ST | Transaction Set Header |
| BEG | Beginning Segment for Purchase Order |
| NTE | Note/Special Instruction |
| CUR | Currency |
| REF | Reference Numbers |
| PER | Administrative Communication Contact |
| TAX | Tax Reference |
| FOB | F.O.B. Related Instructions |
| CTP | Pricing Information |
| CSH | Header Sale Condition |
| SAC | Service, Promotion, Allowance, or Charge Information |
| ITD | Terms of Sale/Deferred Terms of Sale |
| DIS | Discount Detail |
| INC | Installment Information |
| DTM | Date/Time Reference |
| LDT | Lead Time |
| LIN | Item Identification |
| SI | Service Characteristic Identification |
| PID | Product/Item Description |
| (there are more segments than listed here...) | |
| CTT | Transaction Totals |
| AMT | Monetary Amount |
| SE | Transaction Set Trailer |