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- BeginString(8) is not the first tag in a message or is not of the format 8=FIXT.n.m.
- BodyLength(9) is not the second tag in a message or does not contain the correct byte count.
- MsgType(35) is not the third tag in a message.
- Checksum(10) is not the last tag or contains an incorrect value.
If the MsgSeqNum(34) is missing a Logout<5> message should be sent terminating the FIX Connection, as this indicates a serious application error that is likely only circumvented by software modification.
