diff --git a/frepple/controllers/outbound.py b/frepple/controllers/outbound.py
index 41fc973..a3595e8 100644
--- a/frepple/controllers/outbound.py
+++ b/frepple/controllers/outbound.py
@@ -1987,7 +1987,7 @@ def getReservedQuantity(stock_move_id):
                                 ),
                                 due,
                                 priority,
-                                j["picking_policy"] == "one" and qty or 0.0,
+                                qty - reserved_quantity if j["picking_policy"] == "one" and qty - reserved_quantity > 0 else 0.0,
                                 "open" if qty - reserved_quantity > 0 else "closed",
                                 quoteattr(product["name"]),
                                 quoteattr(customer),
@@ -2047,7 +2047,7 @@ def getReservedQuantity(stock_move_id):
                 qty,
                 due,
                 priority,
-                j["picking_policy"] == "one" and qty or 0.0,
+                qty if j["picking_policy"] == "one" and qty > 0 else 0.0,
                 status,
                 quoteattr(product["name"]),
                 quoteattr(customer),