-- Read-only check for amounts mangled by the SQL_Float culture bug (fixed 2026-10-01).
-- No corrections are to be made from this: issued invoices are not changed retrospectively.
--
-- What was at risk: only the VAT amount of a negative invoice (Storno / Gutschrift / Korrektur).
-- FdsInvoiceData.HighestVat formatted it invariantly ("-615.38"), and the old OCORE SQL_Float parsed a
-- negative value with the server's de-DE culture ("." = thousands separator) -> -61538. When the VAT
-- carried float noise ("-615.3757999999999") the result overflowed numeric(10,3) and the save failed
-- (the reported error); without noise it would have been stored scaled by 10/100/1000.
-- The header totals (InvoiceBalance / _net) and service totals were formatted and parsed in the same
-- culture and were never affected. Negative amounts themselves are legitimate.
--
-- Bug signature: InvoiceVAT_net1 = (InvoiceBalance - InvoiceBalance_net) * 10 / 100 / 1000.
SELECT  i.[Id], i.[InvoiceId], i.[InvoiceType], i.[IsFinal], i.[DateCreated], i.[DateModified],
        i.[InvoiceBalance], i.[InvoiceBalance_net], i.[InvoiceVAT_net1],
        vat_from_totals = i.[InvoiceBalance] - i.[InvoiceBalance_net],
        vat_scaled_by_bug = CASE WHEN EXISTS (SELECT 1 FROM (VALUES (10), (100), (1000)) f(n)
                                  WHERE i.[InvoiceBalance] - i.[InvoiceBalance_net] <> 0
                                    AND ABS(i.[InvoiceVAT_net1] - (i.[InvoiceBalance] - i.[InvoiceBalance_net]) * f.n) <= 0.05 * f.n)
                                 THEN 1 ELSE 0 END
FROM    [dbo].[fds__invoices] i
WHERE   i.[InvoiceBalance] < 0 OR i.[InvoiceBalance_net] < 0 OR i.[InvoiceVAT_net1] < 0
ORDER BY vat_scaled_by_bug DESC, i.[DateModified] DESC;