Our system takes in MF orders via fix and we return the ack as 35=8 message with 39=0 and 150=0. Is it mandatory to send back tags 6, 14 and 151 on ack’s? this is prior to the MF order being sent to the MF company and just the ack our system received the order to send further.
In FIX 4.4 these fields are all mandatory. In FIX Latest AvgPx(6) is not required for markets that don’t calculate an average price but CumQty(14) and LeavesQty(151) are still required.
In an ack it’s simply LeavesQty(151)=order qty and CumQty(14)=0 since nothing has been filled. In the FIX 4.4 case, for an ack use AvgPx(6)=0