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in reply to Excel::Writer::XLSX; Multi-worksheets formulas disappear on loading

In the docs for Excel::Writer::XLSX there is a section on formulas titled 'Non US Excel functions and syntax' which states:
Excel stores formulas in the format of the US English version, regardless of the language or locale of the end-user's version of Excel. Therefore all formula function names written using Excel::Writer::XLSX must be in English.
So you need to change the =NB.SI to =COUNTIF. The same section also states:
Formulas must be written with the US style separator/range operator which is a comma (not semi-colon).
So you need to change the E;A$current_line to E,A$current_line.
$README->write_row("A$current_line", [$_, "=COUNTIF('$out'!E:E,A$curre +nt_line)"]);
When I made those two changes to your example code the formulas worked correctly.

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Re^2: Excel::Writer::XLSX; Multi-worksheets formulas disappear on loading
by Bananorpion (Initiate) on Jan 15, 2018 at 12:25 UTC

    Indeed, I wasn't on the right track and totally missed that, and I didn't even know US functions had different names.. That's two things I learned then. This all runs fine now, thanks a lot. ;)