X12-850-PO1
X12 850 PO1 is the PO1 segment in X12 850 (Purchase Order) Transaction Set that describes an order line: quantity, price, product identification.
Definition
PO1 is the order-side counterpart of IT1. Structure: assigned identification, quantity ordered, unit, unit price, basis, product code qualifiers. It opens each PO1 loop of an 850.
Origin
Present since the first 850 version (002001, 1983). Unchanged across all subsequent versions, it is one of the most used segments in North American B2B.
Use
For an order of 100 units at USD 15.00: PO1*1*100*EA*15.00**VP*ACME-WIDGET-001*UP*012345678901. The quantity is firm and quantity×price coherence is checked by the receiver upon arrival.