As part of the reconcilation of book value, I have discovered the reason that many Non-Inventory item's (item type "N") book value is wrong.  Non-inventory item, by nature should never have a book value in BKICMSTR.BKIC_PROD_TOTVL.  I have discovered that any time there is an inventory transaction type "C", $ Change, DBA is incrementing or decrementing the book value.