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My apologies. Let me start over. I have the following two tables as source data: ORDERS {Orders.order#},{Orders.item#},{Orders.qty_ordered} 1000, RD34, 7 1001, RX99, 1 1002, RD34, 6 1003, RD34, 3 ITEMS {Items.item#},{Items.orig_qty_on_hand} RD34,21 RX99,18 The tables are linked...

No. It changes (gets reduced) after each order that contains that item. Only the first order containing the item should use the value from the data table. All lines after that should use this formula I am trying to build. -Dave

That number is in the data table; in the 'QTY ON HAND' field. Thx Dave

Thanks synapsevampire, The data for Qty on Hand isn't in the table, so I have to calculate it. And sometimes the previous record won't be for the same item - so I need it to go back until it finds the last record with the same item and returns that line's qty on hand. -Dave

Sure. Thanks Ibass. Using column names for this example of: Order #, Item #, Qty Ordered, Updated Qty On Hand The result should be... 1000, RD34, 7, 14 1001, RX99, 1, 5 1002, RD34, 6, 8 (14-6=8) 1003, RD34, 3, 5 (8-3=5) All values come directly from the source data, except the 'Updated Qty...

CR Ver 8.5/WinXP/Pervasive DB Need help finding a formula I can use to find a previous record that matches a value in the current record. Example: Current Record: order #: 3344 item: CDR34 qty ordered: 1 qty on hand*: previous 'qty on hand' for this item -1 *I need to insert a formula...