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Hi @David Page
Can you take some screenshots of the formula and the data on master sheet?
Please note, if there is any privacy information, you can cover it.
Then according to the article "How to correct a #NAME? error", I suggest you check whether "ARINVT_E [the worksheet with the master inventory]" in your formula is written correctly. Not just the writing format, the spelling, but also the data range.
Such as my sample, my "master sheet" is called "Sheet2".
The "project sheet" is called "Sheet1", and I need to add Sheet2! to point the range of the data source (From A2 to C4 on Sheet 2) in my formula.
Any updates, welcome to post back.
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