Asset Insurance Calculations

Has anyone had much experience using the Insurance Calculation fuctionality in Assets?  I am attempting to replicate the current client insurance calculations and based on testing results in Oracle the calculation is different than I would expect based on the insurance indexes provided by the Insurance Company.  The client's insurance company provides indexes that increase as the Asset ages (so to speak).  Every asset class (category) has an index value of '1' in the current year meaning that the insurance value (replacement cost) is equal to the asset cost if the asset were placed in service in the current year (makes complete sense).  Now when we get