The formula you gave above will produce TRUE if the net total of entries for that XREF is 0 (FALSE otherwise) and seems like a reasonable formula. What do you mean it has not found all entries? You have to make sure that all matching XREFs are stored identically--no spaces at the beginning or end.
You don't need SUMIFS because there is only one criterion. I tried this and it worked fine:
Formula:
=ROUND(SUMIF(A:A,A2,B:B),2)=0
See attached example.
I know this is just a small sample, but none of your XREF data nets to 0, so it's hard to give it a thorough test. I added couple of numbers to force a TRUE answer and that formula worked fine for me. If it doesn't work in your full data, you need to show enough data to demonstrate where it doesn't work.
If you put your file in a ZIP file and it's under 9MB, you can attach it. For some reason the limit for zip files is much larger than for Excel files.
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