This query can be run to find all the assets that have not be scanned in 12 months or 24 months in a stocktake, so we know the missing items. You'll need to change the EntryDateTime to get the records within your specified timeframe.
You can execute this query using Excel Query Builder in RentalPoint... |
SELECT A1.* FROM tblAsset01 A1 WHERE ISNULL(A1.asset_code, '') <> '' AND A1.ASSET_CODE NOT IN (SELECT DISTINCT A.asset_code FROM tblasset01 A INNER JOIN tblStockTakHistory S ON S.Product_code = A.PRODUCT_COde AND S.Stock_Number = A.STOCK_NUMBER WHERE EntryDateTime < '2016-12-31' )