Reject

Tag	Field Name	Required	Description
35	MsgType	Y	3
45	RefSeqNum	Y	MsgSeqNum of rejected message.
371	RefTagID	N
372	RefMsgType	N
373	SessionRejectReason	N
58	Text	N

Session level rejects are used to indicate violations of the session protocol, or missing (or bogus) fields. These are to be expected during development and certification, while the TPH is being adapted for CFE, but should be extremely rare in production. Application layer rejects (like Order Reject and Cancel Reject) are normal.