diff --git a/Examples/BookingSystem.AspNetCore/Extensions/BookedOrderItemHelper.cs b/Examples/BookingSystem.AspNetCore/Extensions/BookedOrderItemHelper.cs
index 997599fd..1bb6965b 100644
--- a/Examples/BookingSystem.AspNetCore/Extensions/BookedOrderItemHelper.cs
+++ b/Examples/BookingSystem.AspNetCore/Extensions/BookedOrderItemHelper.cs
@@ -52,5 +52,13 @@ public static void AddPropertiesToBookedOrderItem(IOrderItemContext ctx, BookedO
             }
         }
 
+        public static void RemovePropertiesFromBookedOrderItem(IOrderItemContext ctx)
+        {
+            // Set RemainingAttendeeCapacity and MaximumAttendeeCapacity to null as the do not belong in the B and P responses.
+            // For more information see: https://github.com/openactive/open-booking-api/issues/156#issuecomment-926643733
+            ctx.ResponseOrderItem.OrderedItem.Object.RemainingAttendeeCapacity = null;
+            ctx.ResponseOrderItem.OrderedItem.Object.MaximumAttendeeCapacity = null;
+        }
+
     }
 }
diff --git a/Examples/BookingSystem.AspNetCore/Stores/FacilityStore.cs b/Examples/BookingSystem.AspNetCore/Stores/FacilityStore.cs
index cc8b6990..f506d119 100644
--- a/Examples/BookingSystem.AspNetCore/Stores/FacilityStore.cs
+++ b/Examples/BookingSystem.AspNetCore/Stores/FacilityStore.cs
@@ -560,6 +560,8 @@ protected override async ValueTask BookOrderItems(List<OrderItemContext<Facility
                             // Set OrderItemId and access properties for each orderItemContext
                             ctx.SetOrderItemId(flowContext, bookedOrderItemInfo.OrderItemId);
                             BookedOrderItemHelper.AddPropertiesToBookedOrderItem(ctx, bookedOrderItemInfo);
+                            // Remove attendee capacity information from the OrderedItem. For more information see: https://github.com/openactive/open-booking-api/issues/156#issuecomment-926643733
+                            BookedOrderItemHelper.RemovePropertiesFromBookedOrderItem(ctx);
                         }
                         break;
                     case ReserveOrderItemsResult.SellerIdMismatch:
@@ -621,6 +623,8 @@ protected override async ValueTask ProposeOrderItems(List<OrderItemContext<Facil
                         foreach (var (ctx, bookedOrderItemInfo) in ctxGroup.Zip(bookedOrderItemInfos, (ctx, bookedOrderItemInfo) => (ctx, bookedOrderItemInfo)))
                         {
                             ctx.SetOrderItemId(flowContext, bookedOrderItemInfo.OrderItemId);
+                            // Remove attendee capacity information from the OrderedItem. For more information see: https://github.com/openactive/open-booking-api/issues/156#issuecomment-926643733
+                            BookedOrderItemHelper.RemovePropertiesFromBookedOrderItem(ctx);
                         }
                         break;
                     case ReserveOrderItemsResult.SellerIdMismatch:
diff --git a/Examples/BookingSystem.AspNetCore/Stores/SessionStore.cs b/Examples/BookingSystem.AspNetCore/Stores/SessionStore.cs
index 6dc4685e..912579f7 100644
--- a/Examples/BookingSystem.AspNetCore/Stores/SessionStore.cs
+++ b/Examples/BookingSystem.AspNetCore/Stores/SessionStore.cs
@@ -524,7 +524,7 @@ protected override async ValueTask LeaseOrderItems(
                 }
             }
         }
-       // TODO: This should reuse code of LeaseOrderItem to be DRY. Similar logic is also used in ProposeOrderItems as well as
+        // TODO: This should reuse code of LeaseOrderItem to be DRY. Similar logic is also used in ProposeOrderItems as well as
         // in LeaseOrderItems, BookOrderItems, and ProposeOrderItems in the SessionStore. The issue for this is: https://github.com/openactive/OpenActive.Server.NET/issues/226
         protected override async ValueTask BookOrderItems(List<OrderItemContext<SessionOpportunity>> orderItemContexts, StoreBookingFlowContext flowContext, OrderStateContext stateContext, OrderTransaction databaseTransaction)
         {
@@ -581,6 +581,8 @@ protected override async ValueTask BookOrderItems(List<OrderItemContext<SessionO
                             // Set OrderItemId and access properties for each orderItemContext
                             ctx.SetOrderItemId(flowContext, bookedOrderItemInfo.OrderItemId);
                             BookedOrderItemHelper.AddPropertiesToBookedOrderItem(ctx, bookedOrderItemInfo);
+                            // Remove attendee capacity information from the OrderedItem. For more information see: https://github.com/openactive/open-booking-api/issues/156#issuecomment-926643733
+                            BookedOrderItemHelper.RemovePropertiesFromBookedOrderItem(ctx);
                         }
                         break;
                     case ReserveOrderItemsResult.SellerIdMismatch:
@@ -643,6 +645,8 @@ protected override async ValueTask ProposeOrderItems(List<OrderItemContext<Sessi
                         foreach (var (ctx, bookedOrderItemInfo) in ctxGroup.Zip(bookedOrderItemInfos, (ctx, bookedOrderItemInfo) => (ctx, bookedOrderItemInfo)))
                         {
                             ctx.SetOrderItemId(flowContext, bookedOrderItemInfo.OrderItemId);
+                            // Remove attendee capacity information from the OrderedItem. For more information see: https://github.com/openactive/open-booking-api/issues/156#issuecomment-926643733
+                            BookedOrderItemHelper.RemovePropertiesFromBookedOrderItem(ctx);
                         }
                         break;
                     case ReserveOrderItemsResult.SellerIdMismatch: