Standard Message Header


Tag	Field Name	Required	Description
8	BeginString	Y	FIX.4.2 Must be first field in message
9	BodyLength	Y	Length of message following BodyLength field up to and including the delimiter preceding the CheckSum field. Must be second field in message.
35	MsgType	Y	Must be third field in message
49	SenderCompID	Y	ID of sender: Assigned by CFE for messages sent to CFE (TargetCompID for messages from CFE)
50	SenderSubID	Y	Sub ID of sender: Assigned by CFE for messages sent to CFE. (TargetSubID for messages from CFE)
56	TargetCompID	Y	ID of destination: CFE = messages sent to CFE (SenderCompID for messages from CFE)
57	TargetSubID	Y	Sub ID of destination: TEST = messages sent to CFE test system PROD = messages sent to CFE production system (SenderSubID for messages from CFE)
34	MsgSeqNum	Y	Sequential sequence number for session
43	PossDupFlag	N	N = (Default) Y = Indicates a message resend and should be used during FIX Replay. All inbound orders with a value of ‘Y’ will be rejected by Cboe.
52	SendingTime	Y	GMT date-time that message was sent
122	OrigSendingTime	N	For messages with PossDupFlag=‘Y’, indicates time that message was first sent
115	OnBehalfOfCompID	N	Used to specify clearing information on messages to CFE. Must be an allowed Executing Firm ID (EFID). Sent to OCC in Exec Broker field.
116	OnBehalfOfSubID	N	End-client sub identifier. 4 Characters alphanumeric, otherwise not validated. Recorded and returned in DeliverToSubID. Available via Drop feeds
128	DeliverToCompId	N	Identifies end-client on messages from CFE. Used to specify clearing information
129	DeliverToSubID	N	Returns OnBehalfOfSubID optionally sent by client
142	SenderLocationID	Y	Identifies the country code of the person or system submitting the order using the ISO 3166 two-character code (must be entered using uppercase letters only). An order with a country code for a comprehensively sanctioned country will be rejected.

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Standard Message Header