Field OnBehalfOfSendingTime (370) - FIX Protocol FIX.4.3
Used when a message is sent via a "hub" or "service bureau". If A sends to Q (the hub) who then sends to B via a separate FIX session, then when Q sends to B the value of this field should represent the SendingTime on the message A sent to Q. (always expressed in UTC (Universal Time Coordinated, also known as "GMT")
Added in protocol FIX.4.2
See in: FIX.4.2.