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8.3.2 MFD/ACK - master files delayed application acknowledgment

The MFD transaction is the delayed application acknowledgment. It can be used to return "deferred" application-level acknowledgment statuses at the MFE level, without reference to the original MFN message. It is defined as follows:

MFD     Master File Delayed Acknowledgment   Chapter
MSH     Message Header        2
MFI     Master File Identification     8
  { [MFA] }   Master file ACK segment      8
ACK     General Acknowledgment     Chapter
MSH     Message Header        2
MSA     Acknowledgment        2
[ ERR ]    Error          2

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