Inventory received Not Billed

Our balance sheet shows an amount on Inventory received Not Billed at the balance sheet date. The balance sheet date could be any date but let us say it is 31/03/10. I am trying to create a saved search which would show only the items receipted by 31/03/10 and not billed at 31/03/10. The receipted value should be equal to the value outstanding on the Inventory received not billed account at the balance sheet date. The saved search should also show in which period those items receipted by 31/03/10 were billed post 31/03/10 date. This would enable any adjustment that