Calculation of Available Quantity in E9.05

After running the Reserve function in Fulfillment Workbench, we have some parts that are being reserved even though there is not enough quantity in the primary warehouse/bin. When you reserve parts for customer orders, does the function look at all non-nettable bin locations? Also, does it look at anything coming through on WIP?

Example:

Part A - quantity of 6 in primary warehouse/bin. There are 3 oldest customer orders of 20, 10, and 126. It reserves those parts, resulting in an available qty of -150. No other customer orders for this part are reserved. There are quantities in RMA Inspection status, which the warehouse/bin is set as nettable.