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Looks like sometime in the last few months this feature has partially broke. The accounts are being updated correctly when items are written off with tax, but the tax amount is not showing on the various tax reports.
It worked at the beginning of this year, but now the values are not being included. The old reports that I had generated at the beginning of this year and last year are all incorrect now as well.
I have ensured that I am running the latest version but still no change.
Thanks.