Can create order with item quantity > max available quantity

Description

Precondition: A line item with a max available quantity setting of 8.
Steps to reproduce:

1. Go to commerce manager.
2. Select order management.
3. Click New Order to create new order.
4. Click New Item to add a line item.
5. Select a line item (for example, Accessories-Electronics-200WattsAMFMCDReceiver-sku), then click Configure Selected Entry.
6. Enter an Input Quantity of 7 then add the item to the order.
7. Repeat steps 4 to 6 > the total count for item Accessories-Electronics-200WattsAMFMCDReceiver-sku is 14.
8. Complete other mandatory fields and click OK.

Expected: Should adjust second line item to 1 (because max available quantity = 8) and recalculate the order.
Actual: Order with these line items is created.