Partial Fills on Orders (Fixed Income Style Trading)

Many fixed income systems expect a single execution per order. OpenYield follows equity-style fill semantics: an aggressive order can receive multiple partial fills as it works through available liquidity, each delivered as a separate execution.

There is no separate completion message. The final fill has OrdStatus Filled (39=2); if the remainder is canceled or expires, the final message is a cancel (150=4, 39=4) with CumQty (14) showing the quantity filled. Book each fill as an individual execution on the same order.