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Hi Blush0508,
I go through the post. The implicit intersection operator @ was introduced as part of substantial upgrade to Excel's formula language to support dynamic arrays. As you can see in this article: Implicit intersection operator: @
“Implicit intersection logic reduces many values to a single value. Excel did this to force a formula to return a single value, since a cell could only contain a single value.” Since it is an upgrade formula language, you may not see the symbol in Excel with version that doesn’t support Dynamic Array.
The formula you shared with us indicates Criteria part of the SUMIF function is array type because it references data in a whole column. It could be a reason why there is @.
If you compare invoice number in the same row in two sheets, I think you can change the formula to:
=IF(Sheet1!B:B=Sheet!C:C,Sheet1!M:M,”Not Found”).
Because the behavior is related to Excel of different Version. I would suggest you check if the person has different version of Excel from others.
Regards,
Clark