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@BetterRed, @JSWolf, @stumped, I've created a custom column T (for the shortcut key for Edit Book). When I edit a book, I need to remember to update column T. Then I can select on values in column T to find what I want.
@Better Red, However, I would like to create a custom column that is based on the template language value formats_modtimes. When I create a custom column - Column built from other columns as any of :
{formats_modtimes:select()}
{formats_modtimes('EPUB')}
{formats_modtimes:select('EPUB')}
the column creates, but the value in all cases is TEMPLATE ERROR Value: unknown field formats_modtimes
Any clue what I have done wrong?
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