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Factset Fundamentals, Source 10-Q/A, Quarterly Report, Annual Report, 6-K, 10-K/A

I've just noted, that some Factset Fundamentals have 10-Q/A or 10-K/A as source_doc.
Are you sure, that it's not wrong?
In my opinion, one should always use the initial data, otherwise restated or amended filings introduce a bias in backtesting.
Any thoughts?