Need Documentation for MessageHeader

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Imported from previous forum

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Can you please let us know which document conatins the description of NewOrder, MessageHeader fields description. For example we are looking for all the possible fields description

<Hdr

Snt=“2001-09-11T09:30:47-05:00” — Order Sent Time
PosDup=“N” — Set Possible Duplicate
PosRsnd=“N” — Set Resend
SeqNum=“521” — Sequence Number
SID=“AFUNDMGR” — Sender Id
TID=“ABROKER” — Target Id

There others also, can we get the desction of those.

Thanks