Hide Details Command Rows(1).ShowDetail = False does not work

Hey guys,

I am facing issues with a simple macro.

I wanted to include a code into my VBA code which hides the details of the group (not hiding a row but "pressing the minus button").
However, it didn't work. To ensure that it is not a problem with my code or the file, I opened a complete new empty MS Excel 2013 sheet and used just the simple line I found frequently on the internet:

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And I got an error and the debugger marked the line.

I am using Excel 2013. It is a German license but the language is English. I had an issue with the number codes in Excel once (no VBA), where the numbers where not displayed properly until I changed all , for .

Looking forward to hear your experiences and suggestions.

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