To indicate the start of a transaction set and to assign a control number
To specify primary identification data for request or information
To assign an identification to a docket
400
PR1
Price Request Parameter List 1
To request price information based on certain parameters such as commodity, origin, and destination
500
PR2
Price Request Parameter List 2
To request price information based on certain parameters such as date, route, equipment type, and customer
600
PI
Price Authority Identification
To communicate basis of pricing, such as contract number, quote number, or tariff number
To indicate the end of the transaction set and provide the count of the transmitted segments (including the beginning (ST) and ending (SE) segments)