IEA Interchange Control Trailer
To define the end of an interchange of one or more functional groups and interchange-related control segments
A count of the number of functional groups included in a transmission.
This number uniquely identifies the interchange data to the sender. It is assigned by the sender. Together with the sender ID it uniquely identifies the interchange data to the receiver. It is suggested that the sender, receiver, and all third parties be able to maintain an audit trail of interchanges using this number.