The CONTRL Message
The CRG have decided to support the CONTRL message as developed by APACS.
The function of this message is to provide the means for syntactically acknowledging or rejecting, with an indication of the error(s) encountered, a received interchange or message. It can also be used to indicate only the receipt of an interchange prior to any processing which would lead to errors being recognised.
1. On page 12 in UNH-0057 the qualifier "APACS" is not used.
2. Pages 26 ff.: Functional groups are not used.