Dealing with unbilled costs

We generally invoice our customers as soon as we order a drop shipment from our vendors.  Sometimes a week or two passes before we get the bill from our vendor.  Since we record the revenue when we bill the customer and the cost is not recorded until we enter the vendor bill, this creates a temporary net income overstatement.

This is a problem for us, since we rely on NetSuite for real time reporting.  I could do a journal entry to a temporary liablily account similar to "Inventory Received Not Billed", but we would have to remember to reverse that entry when the vendor bill was entered.