TA1 Interchange Acknowledgment
To report the status of the processing of an interchange header, trailer, and other interchange-level service request structures by the addressed receiver, or the non-delivery by a network provider. It may also be used to report an error processing the GS segment.
A control number assigned by the interchange sender
Date of the interchange
Time of the interchange
Code indicating the status of the receipt of the interchange control structure
Code specifying the error found processing the interchange control structure