Purchase Order Transmission Flow
The above diagram demonstrates the transmission flow of an 850 Purchase Order from a trading partner's server to your own. In order for the file to be properly routed, the sender and receiver qualifier ID's (located in the ISA segment) are identified throughout each of the steps. Furthermore, each transmission is assigned an Interchange Control Number by the sending party to uniquely identify a transmission for a given sender and receiver qualifier ID pair. Control numbers within the Interchange Control Number, Functional Group Trailer, and Transaction Set Trailer segments also provde the means for each step to verify that the complete transmission was received.