Provides a Technical Acknowledgment (TA1) to the Interchange sender that reports the status of the processing of an interchange header and trailer by the address receiver.
When the ISA and IEA of the received X12 message are valid, a positive TA1 ACK is sent, regardless of what the status of the other content is. If the ISA and IEA of the received X12 message is not valid, a TA1 ACK with an error code is sent.
The TA1 ACK is sent inside an ISA or IEA envelope. The ISA and IEA are no different than any other interchange.