The Not Applied message is sent when CME detects a sequence gap from the customer.
First not applied sequence number.
Count of how many messages have not been applied.
This is the difference between:
the sequence number (tag 9726-SeqNum) of the last business message received OR the last next sequence number (tag 39013-NextSeqNo) in the Establish message from the customer (inclusive)
the sequence number (tag 9726-SeqNum) of the new business message received OR the new next sequence number (tag 39013-NextSeqNo) in the Establish message from the customer (inclusive)
Although the Establish message does not have its own sequence number, the tag 39013-NextSeqNo value sent in the Establish message is used to calculate the number of messages that have not been applied.
0=Split Msg Delayed
1=Out of Order Msg Delayed
2=Complete Msg Delayed
Indicates if a message was delayed as a result of:
If absent then the message was not delayed, split, or received out of order