diff --git a/src/ml4t/backtest/core/execution_engine.py b/src/ml4t/backtest/core/execution_engine.py
index 6da75ef..8ce1cef 100644
--- a/src/ml4t/backtest/core/execution_engine.py
+++ b/src/ml4t/backtest/core/execution_engine.py
@@ -496,10 +496,14 @@ def _process_single_order(self, order, use_open: bool, filled_orders: list) -> N
                     # Permissive mode: silently skip unaffordable orders for this cycle
                     # by cancelling them instead of keeping them pending forever.
                     order.status = OrderStatus.CANCELLED
-            elif broker.partial_fills_allowed and "insufficient" in rejection_reason.lower() or (
-                order.rebalance_id is not None
-                and broker.share_type.value == "integer"
+            elif (
+                broker.partial_fills_allowed
                 and "insufficient" in rejection_reason.lower()
+                or (
+                    order.rebalance_id is not None
+                    and broker.share_type.value == "integer"
+                    and "insufficient" in rejection_reason.lower()
+                )
             ):
                 if fill.try_partial_fill(order, fill_price):
                     filled_orders.append(order)