Field OrigOrdModTime (586) - FIX Protocol FIX.5.0SP2 EP240
The most recent (or current) modification TransactTime (tag 60) reported on an Execution Report for the order. The OrigOrdModTime is provided as an optional field on Order Cancel Request and Order Cancel Replace Requests to identify that the state of the order has not changed since the request was issued. The use of this approach is not recommended.
Added in protocol FIX.4.3