MassCancelAcknowledgementUSFuturesV1

Field Name	Offset	Length	Data Type	Description
StartOfMessage	0	2	Binary	B0 E3 (58288)
MessageLength	2	2	Binary	32 00 (50)
MessageType	4	2	Binary	E4 05 (1508)
MatchingUnit	6	1	Binary	Matching Unit which created this message.
Reserved	7	1	Binary	Unspecified
SequenceNumber	8	4	Binary	Always zero (unsequenced)
TransactionTime	12	8	DateTime	The time the event occurred in the CFE Matching Engine (not the time the message was sent).
MassCancelId	20	20	Text	Echoed back from the TPH message
CancelledOrderCount	40	4	Binary	Number of orders cancelled.
RequestReceivedTime	44	8	DateTime	The earliest timestamp, populated with nanosecond precision, recorded by CFE of the corresponding inbound message being acknowledged. Populated with zero in event of failover to Port B or Port C.

(New fields may be introduced at the end of this message. Consequently, TPHs must treat any additional bytes present as undefined values.)