thank you for your reply, now I feel better that I'm not losing my mind :-) This computed field concept is not new in the database world, it simply is better documented allowing reverse engineering. I think I found where the "inventory" flow field is calculated - on the item ledger table - Any idea how the "Quantity on PO" and "Quantity on Sales Order" are calculated? If I'm right NAV appears to sum the rows in a table for these 3 fields (what an horrible concept that explains why we have such a poor performance database). Thank you in advance
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